diff --git a/config.h.in b/config.h.in
index d0983c83e..46f38edf3 100644
--- a/config.h.in
+++ b/config.h.in
@@ -874,8 +874,6 @@ char *strptime(const char *s, const char *format, struct tm *tm);
 #  endif
 #endif /* CHECKED_INET6 */
 
-/* maximum nesting of included files */
-#define MAXINCLUDES 10
 #ifndef HAVE_GETADDRINFO
 struct sockaddr_storage;
 #include "compat/fake-rfc2553.h"
diff --git a/configure.ac b/configure.ac
index e9058bed3..8c83fdd7e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1214,8 +1214,6 @@ char *strptime(const char *s, const char *format, struct tm *tm);
 #  endif
 #endif /* CHECKED_INET6 */
 
-/* maximum nesting of included files */
-#define MAXINCLUDES 10
 #ifndef HAVE_GETADDRINFO
 struct sockaddr_storage;
 #include "compat/fake-rfc2553.h"
diff --git a/doc/Changelog b/doc/Changelog
index 128d5d5f6..49a8d9e8a 100644
--- a/doc/Changelog
+++ b/doc/Changelog
@@ -1,6 +1,7 @@
 10 Jun 2013: Wouter
 	- Fix#501: forward-first does not recurse, when forward name is ".".
 	- iana portlist update.
+	- Max include depth is unlimited.
 
 27 May 2013: Wouter
 	- Update acx_pthreads.m4 to ax_pthreads.4 (2013-03-29), and apply
diff --git a/util/configlexer.c b/util/configlexer.c
index 70619ea31..c9c2e1b47 100644
--- a/util/configlexer.c
+++ b/util/configlexer.c
@@ -1543,43 +1543,54 @@ void ub_c_error(const char *message);
 struct inc_state {
 	char* filename;
 	int line;
+	YY_BUFFER_STATE buffer;
+	struct inc_state* next;
 };
-static struct inc_state parse_stack[MAXINCLUDES];
-static YY_BUFFER_STATE include_stack[MAXINCLUDES];
-static int config_include_stack_ptr = 0;
+static struct inc_state* config_include_stack = NULL;
 static int inc_prev = 0;
 static int num_args = 0;
 
-
 static void config_start_include(const char* filename)
 {
 	FILE *input;
+	struct inc_state* s;
+	char* nm;
 	if(strlen(filename) == 0) {
 		ub_c_error_msg("empty include file name");
 		return;
 	}
-	if(config_include_stack_ptr >= MAXINCLUDES) {
-		ub_c_error_msg("includes nested too deeply, skipped (>%d)", MAXINCLUDES);
+	s = (struct inc_state*)malloc(sizeof(*s));
+	if(!s) {
+		ub_c_error_msg("include %s: malloc failure", filename);
 		return;
 	}
 	if(cfg_parser->chroot && strncmp(filename, cfg_parser->chroot,
 		strlen(cfg_parser->chroot)) == 0) {
 		filename += strlen(cfg_parser->chroot);
 	}
+	nm = strdup(filename);
+	if(!nm) {
+		ub_c_error_msg("include %s: malloc failure", filename);
+		free(s);
+		return;
+	}
 	input = fopen(filename, "r");
 	if(!input) {
 		ub_c_error_msg("cannot open include file '%s': %s",
 			filename, strerror(errno));
+		free(s);
+		free(nm);
 		return;
 	}
-	LEXOUT(("switch_to_include_file(%s) ", filename));
-	parse_stack[config_include_stack_ptr].filename = cfg_parser->filename;
-	parse_stack[config_include_stack_ptr].line = cfg_parser->line;
-	include_stack[config_include_stack_ptr] = YY_CURRENT_BUFFER;
-	cfg_parser->filename = strdup(filename);
+	LEXOUT(("switch_to_include_file(%s)\n", filename));
+	s->filename = cfg_parser->filename;
+	s->line = cfg_parser->line;
+	s->buffer = YY_CURRENT_BUFFER;
+	s->next = config_include_stack;
+	config_include_stack = s;
+	cfg_parser->filename = nm;
 	cfg_parser->line = 1;
 	yy_switch_to_buffer(yy_create_buffer(input,YY_BUF_SIZE));
-	++config_include_stack_ptr;
 }
 
 static void config_start_include_glob(const char* filename)
@@ -1630,12 +1641,15 @@ static void config_start_include_glob(const char* filename)
 
 static void config_end_include(void)
 {
-	--config_include_stack_ptr;
+	struct inc_state* s = config_include_stack;
+	if(!s) return;
 	free(cfg_parser->filename);
-	cfg_parser->filename = parse_stack[config_include_stack_ptr].filename;
-	cfg_parser->line = parse_stack[config_include_stack_ptr].line;
+	cfg_parser->filename = s->filename;
+	cfg_parser->line = s->line;
 	yy_delete_buffer(YY_CURRENT_BUFFER);
-	yy_switch_to_buffer(include_stack[config_include_stack_ptr]);
+	yy_switch_to_buffer(s->buffer);
+	config_include_stack = s->next;
+	free(s);
 }
 
 #ifndef yy_set_bol /* compat definition, for flex 2.4.6 */
@@ -1648,7 +1662,7 @@ static void config_end_include(void)
 #endif
 
 #define YY_NO_INPUT 1
-#line 150 "./util/configlexer.lex"
+#line 164 "./util/configlexer.lex"
 #ifndef YY_NO_UNPUT
 #define YY_NO_UNPUT 1
 #endif
@@ -1656,7 +1670,7 @@ static void config_end_include(void)
 #define YY_NO_INPUT 1
 #endif
 
-#line 1658 "<stdout>"
+#line 1672 "<stdout>"
 
 #define INITIAL 0
 #define quotedstring 1
@@ -1841,9 +1855,9 @@ YY_DECL
 	register char *yy_cp, *yy_bp;
 	register int yy_act;
     
-#line 170 "./util/configlexer.lex"
+#line 184 "./util/configlexer.lex"
 
-#line 1845 "<stdout>"
+#line 1859 "<stdout>"
 
 	if ( !(yy_init) )
 		{
@@ -1934,632 +1948,632 @@ do_action:	/* This label is used only to access EOF actions. */
 
 case 1:
 YY_RULE_SETUP
-#line 171 "./util/configlexer.lex"
+#line 185 "./util/configlexer.lex"
 { 
 	LEXOUT(("SP ")); /* ignore */ }
 	YY_BREAK
 case 2:
 YY_RULE_SETUP
-#line 173 "./util/configlexer.lex"
+#line 187 "./util/configlexer.lex"
 { 
 	/* note that flex makes the longest match and '.' is any but not nl */
 	LEXOUT(("comment(%s) ", yytext)); /* ignore */ }
 	YY_BREAK
 case 3:
 YY_RULE_SETUP
-#line 176 "./util/configlexer.lex"
+#line 190 "./util/configlexer.lex"
 { YDVAR(0, VAR_SERVER) }
 	YY_BREAK
 case 4:
 YY_RULE_SETUP
-#line 177 "./util/configlexer.lex"
+#line 191 "./util/configlexer.lex"
 { YDVAR(1, VAR_NUM_THREADS) }
 	YY_BREAK
 case 5:
 YY_RULE_SETUP
-#line 178 "./util/configlexer.lex"
+#line 192 "./util/configlexer.lex"
 { YDVAR(1, VAR_VERBOSITY) }
 	YY_BREAK
 case 6:
 YY_RULE_SETUP
-#line 179 "./util/configlexer.lex"
+#line 193 "./util/configlexer.lex"
 { YDVAR(1, VAR_PORT) }
 	YY_BREAK
 case 7:
 YY_RULE_SETUP
-#line 180 "./util/configlexer.lex"
+#line 194 "./util/configlexer.lex"
 { YDVAR(1, VAR_OUTGOING_RANGE) }
 	YY_BREAK
 case 8:
 YY_RULE_SETUP
-#line 181 "./util/configlexer.lex"
+#line 195 "./util/configlexer.lex"
 { YDVAR(1, VAR_OUTGOING_PORT_PERMIT) }
 	YY_BREAK
 case 9:
 YY_RULE_SETUP
-#line 182 "./util/configlexer.lex"
+#line 196 "./util/configlexer.lex"
 { YDVAR(1, VAR_OUTGOING_PORT_AVOID) }
 	YY_BREAK
 case 10:
 YY_RULE_SETUP
-#line 183 "./util/configlexer.lex"
+#line 197 "./util/configlexer.lex"
 { YDVAR(1, VAR_OUTGOING_NUM_TCP) }
 	YY_BREAK
 case 11:
 YY_RULE_SETUP
-#line 184 "./util/configlexer.lex"
+#line 198 "./util/configlexer.lex"
 { YDVAR(1, VAR_INCOMING_NUM_TCP) }
 	YY_BREAK
 case 12:
 YY_RULE_SETUP
-#line 185 "./util/configlexer.lex"
+#line 199 "./util/configlexer.lex"
 { YDVAR(1, VAR_DO_IP4) }
 	YY_BREAK
 case 13:
 YY_RULE_SETUP
-#line 186 "./util/configlexer.lex"
+#line 200 "./util/configlexer.lex"
 { YDVAR(1, VAR_DO_IP6) }
 	YY_BREAK
 case 14:
 YY_RULE_SETUP
-#line 187 "./util/configlexer.lex"
+#line 201 "./util/configlexer.lex"
 { YDVAR(1, VAR_DO_UDP) }
 	YY_BREAK
 case 15:
 YY_RULE_SETUP
-#line 188 "./util/configlexer.lex"
+#line 202 "./util/configlexer.lex"
 { YDVAR(1, VAR_DO_TCP) }
 	YY_BREAK
 case 16:
 YY_RULE_SETUP
-#line 189 "./util/configlexer.lex"
+#line 203 "./util/configlexer.lex"
 { YDVAR(1, VAR_TCP_UPSTREAM) }
 	YY_BREAK
 case 17:
 YY_RULE_SETUP
-#line 190 "./util/configlexer.lex"
+#line 204 "./util/configlexer.lex"
 { YDVAR(1, VAR_SSL_UPSTREAM) }
 	YY_BREAK
 case 18:
 YY_RULE_SETUP
-#line 191 "./util/configlexer.lex"
+#line 205 "./util/configlexer.lex"
 { YDVAR(1, VAR_SSL_SERVICE_KEY) }
 	YY_BREAK
 case 19:
 YY_RULE_SETUP
-#line 192 "./util/configlexer.lex"
+#line 206 "./util/configlexer.lex"
 { YDVAR(1, VAR_SSL_SERVICE_PEM) }
 	YY_BREAK
 case 20:
 YY_RULE_SETUP
-#line 193 "./util/configlexer.lex"
+#line 207 "./util/configlexer.lex"
 { YDVAR(1, VAR_SSL_PORT) }
 	YY_BREAK
 case 21:
 YY_RULE_SETUP
-#line 194 "./util/configlexer.lex"
+#line 208 "./util/configlexer.lex"
 { YDVAR(1, VAR_DO_DAEMONIZE) }
 	YY_BREAK
 case 22:
 YY_RULE_SETUP
-#line 195 "./util/configlexer.lex"
+#line 209 "./util/configlexer.lex"
 { YDVAR(1, VAR_INTERFACE) }
 	YY_BREAK
 case 23:
 YY_RULE_SETUP
-#line 196 "./util/configlexer.lex"
+#line 210 "./util/configlexer.lex"
 { YDVAR(1, VAR_OUTGOING_INTERFACE) }
 	YY_BREAK
 case 24:
 YY_RULE_SETUP
-#line 197 "./util/configlexer.lex"
+#line 211 "./util/configlexer.lex"
 { YDVAR(1, VAR_INTERFACE_AUTOMATIC) }
 	YY_BREAK
 case 25:
 YY_RULE_SETUP
-#line 198 "./util/configlexer.lex"
+#line 212 "./util/configlexer.lex"
 { YDVAR(1, VAR_SO_RCVBUF) }
 	YY_BREAK
 case 26:
 YY_RULE_SETUP
-#line 199 "./util/configlexer.lex"
+#line 213 "./util/configlexer.lex"
 { YDVAR(1, VAR_SO_SNDBUF) }
 	YY_BREAK
 case 27:
 YY_RULE_SETUP
-#line 200 "./util/configlexer.lex"
+#line 214 "./util/configlexer.lex"
 { YDVAR(1, VAR_CHROOT) }
 	YY_BREAK
 case 28:
 YY_RULE_SETUP
-#line 201 "./util/configlexer.lex"
+#line 215 "./util/configlexer.lex"
 { YDVAR(1, VAR_USERNAME) }
 	YY_BREAK
 case 29:
 YY_RULE_SETUP
-#line 202 "./util/configlexer.lex"
+#line 216 "./util/configlexer.lex"
 { YDVAR(1, VAR_DIRECTORY) }
 	YY_BREAK
 case 30:
 YY_RULE_SETUP
-#line 203 "./util/configlexer.lex"
+#line 217 "./util/configlexer.lex"
 { YDVAR(1, VAR_LOGFILE) }
 	YY_BREAK
 case 31:
 YY_RULE_SETUP
-#line 204 "./util/configlexer.lex"
+#line 218 "./util/configlexer.lex"
 { YDVAR(1, VAR_PIDFILE) }
 	YY_BREAK
 case 32:
 YY_RULE_SETUP
-#line 205 "./util/configlexer.lex"
+#line 219 "./util/configlexer.lex"
 { YDVAR(1, VAR_ROOT_HINTS) }
 	YY_BREAK
 case 33:
 YY_RULE_SETUP
-#line 206 "./util/configlexer.lex"
+#line 220 "./util/configlexer.lex"
 { YDVAR(1, VAR_EDNS_BUFFER_SIZE) }
 	YY_BREAK
 case 34:
 YY_RULE_SETUP
-#line 207 "./util/configlexer.lex"
+#line 221 "./util/configlexer.lex"
 { YDVAR(1, VAR_MSG_BUFFER_SIZE) }
 	YY_BREAK
 case 35:
 YY_RULE_SETUP
-#line 208 "./util/configlexer.lex"
+#line 222 "./util/configlexer.lex"
 { YDVAR(1, VAR_MSG_CACHE_SIZE) }
 	YY_BREAK
 case 36:
 YY_RULE_SETUP
-#line 209 "./util/configlexer.lex"
+#line 223 "./util/configlexer.lex"
 { YDVAR(1, VAR_MSG_CACHE_SLABS) }
 	YY_BREAK
 case 37:
 YY_RULE_SETUP
-#line 210 "./util/configlexer.lex"
+#line 224 "./util/configlexer.lex"
 { YDVAR(1, VAR_RRSET_CACHE_SIZE) }
 	YY_BREAK
 case 38:
 YY_RULE_SETUP
-#line 211 "./util/configlexer.lex"
+#line 225 "./util/configlexer.lex"
 { YDVAR(1, VAR_RRSET_CACHE_SLABS) }
 	YY_BREAK
 case 39:
 YY_RULE_SETUP
-#line 212 "./util/configlexer.lex"
+#line 226 "./util/configlexer.lex"
 { YDVAR(1, VAR_CACHE_MAX_TTL) }
 	YY_BREAK
 case 40:
 YY_RULE_SETUP
-#line 213 "./util/configlexer.lex"
+#line 227 "./util/configlexer.lex"
 { YDVAR(1, VAR_CACHE_MIN_TTL) }
 	YY_BREAK
 case 41:
 YY_RULE_SETUP
-#line 214 "./util/configlexer.lex"
+#line 228 "./util/configlexer.lex"
 { YDVAR(1, VAR_INFRA_HOST_TTL) }
 	YY_BREAK
 case 42:
 YY_RULE_SETUP
-#line 215 "./util/configlexer.lex"
+#line 229 "./util/configlexer.lex"
 { YDVAR(1, VAR_INFRA_LAME_TTL) }
 	YY_BREAK
 case 43:
 YY_RULE_SETUP
-#line 216 "./util/configlexer.lex"
+#line 230 "./util/configlexer.lex"
 { YDVAR(1, VAR_INFRA_CACHE_SLABS) }
 	YY_BREAK
 case 44:
 YY_RULE_SETUP
-#line 217 "./util/configlexer.lex"
+#line 231 "./util/configlexer.lex"
 { YDVAR(1, VAR_INFRA_CACHE_NUMHOSTS) }
 	YY_BREAK
 case 45:
 YY_RULE_SETUP
-#line 218 "./util/configlexer.lex"
+#line 232 "./util/configlexer.lex"
 { YDVAR(1, VAR_INFRA_CACHE_LAME_SIZE) }
 	YY_BREAK
 case 46:
 YY_RULE_SETUP
-#line 219 "./util/configlexer.lex"
+#line 233 "./util/configlexer.lex"
 { YDVAR(1, VAR_NUM_QUERIES_PER_THREAD) }
 	YY_BREAK
 case 47:
 YY_RULE_SETUP
-#line 220 "./util/configlexer.lex"
+#line 234 "./util/configlexer.lex"
 { YDVAR(1, VAR_JOSTLE_TIMEOUT) }
 	YY_BREAK
 case 48:
 YY_RULE_SETUP
-#line 221 "./util/configlexer.lex"
+#line 235 "./util/configlexer.lex"
 { YDVAR(1, VAR_TARGET_FETCH_POLICY) }
 	YY_BREAK
 case 49:
 YY_RULE_SETUP
-#line 222 "./util/configlexer.lex"
+#line 236 "./util/configlexer.lex"
 { YDVAR(1, VAR_HARDEN_SHORT_BUFSIZE) }
 	YY_BREAK
 case 50:
 YY_RULE_SETUP
-#line 223 "./util/configlexer.lex"
+#line 237 "./util/configlexer.lex"
 { YDVAR(1, VAR_HARDEN_LARGE_QUERIES) }
 	YY_BREAK
 case 51:
 YY_RULE_SETUP
-#line 224 "./util/configlexer.lex"
+#line 238 "./util/configlexer.lex"
 { YDVAR(1, VAR_HARDEN_GLUE) }
 	YY_BREAK
 case 52:
 YY_RULE_SETUP
-#line 225 "./util/configlexer.lex"
+#line 239 "./util/configlexer.lex"
 { YDVAR(1, VAR_HARDEN_DNSSEC_STRIPPED) }
 	YY_BREAK
 case 53:
 YY_RULE_SETUP
-#line 226 "./util/configlexer.lex"
+#line 240 "./util/configlexer.lex"
 { YDVAR(1, VAR_HARDEN_BELOW_NXDOMAIN) }
 	YY_BREAK
 case 54:
 YY_RULE_SETUP
-#line 227 "./util/configlexer.lex"
+#line 241 "./util/configlexer.lex"
 { YDVAR(1, VAR_HARDEN_REFERRAL_PATH) }
 	YY_BREAK
 case 55:
 YY_RULE_SETUP
-#line 228 "./util/configlexer.lex"
+#line 242 "./util/configlexer.lex"
 { YDVAR(1, VAR_USE_CAPS_FOR_ID) }
 	YY_BREAK
 case 56:
 YY_RULE_SETUP
-#line 229 "./util/configlexer.lex"
+#line 243 "./util/configlexer.lex"
 { YDVAR(1, VAR_UNWANTED_REPLY_THRESHOLD) }
 	YY_BREAK
 case 57:
 YY_RULE_SETUP
-#line 230 "./util/configlexer.lex"
+#line 244 "./util/configlexer.lex"
 { YDVAR(1, VAR_PRIVATE_ADDRESS) }
 	YY_BREAK
 case 58:
 YY_RULE_SETUP
-#line 231 "./util/configlexer.lex"
+#line 245 "./util/configlexer.lex"
 { YDVAR(1, VAR_PRIVATE_DOMAIN) }
 	YY_BREAK
 case 59:
 YY_RULE_SETUP
-#line 232 "./util/configlexer.lex"
+#line 246 "./util/configlexer.lex"
 { YDVAR(1, VAR_PREFETCH_KEY) }
 	YY_BREAK
 case 60:
 YY_RULE_SETUP
-#line 233 "./util/configlexer.lex"
+#line 247 "./util/configlexer.lex"
 { YDVAR(1, VAR_PREFETCH) }
 	YY_BREAK
 case 61:
 YY_RULE_SETUP
-#line 234 "./util/configlexer.lex"
+#line 248 "./util/configlexer.lex"
 { YDVAR(0, VAR_STUB_ZONE) }
 	YY_BREAK
 case 62:
 YY_RULE_SETUP
-#line 235 "./util/configlexer.lex"
+#line 249 "./util/configlexer.lex"
 { YDVAR(1, VAR_NAME) }
 	YY_BREAK
 case 63:
 YY_RULE_SETUP
-#line 236 "./util/configlexer.lex"
+#line 250 "./util/configlexer.lex"
 { YDVAR(1, VAR_STUB_ADDR) }
 	YY_BREAK
 case 64:
 YY_RULE_SETUP
-#line 237 "./util/configlexer.lex"
+#line 251 "./util/configlexer.lex"
 { YDVAR(1, VAR_STUB_HOST) }
 	YY_BREAK
 case 65:
 YY_RULE_SETUP
-#line 238 "./util/configlexer.lex"
+#line 252 "./util/configlexer.lex"
 { YDVAR(1, VAR_STUB_PRIME) }
 	YY_BREAK
 case 66:
 YY_RULE_SETUP
-#line 239 "./util/configlexer.lex"
+#line 253 "./util/configlexer.lex"
 { YDVAR(1, VAR_STUB_FIRST) }
 	YY_BREAK
 case 67:
 YY_RULE_SETUP
-#line 240 "./util/configlexer.lex"
+#line 254 "./util/configlexer.lex"
 { YDVAR(0, VAR_FORWARD_ZONE) }
 	YY_BREAK
 case 68:
 YY_RULE_SETUP
-#line 241 "./util/configlexer.lex"
+#line 255 "./util/configlexer.lex"
 { YDVAR(1, VAR_FORWARD_ADDR) }
 	YY_BREAK
 case 69:
 YY_RULE_SETUP
-#line 242 "./util/configlexer.lex"
+#line 256 "./util/configlexer.lex"
 { YDVAR(1, VAR_FORWARD_HOST) }
 	YY_BREAK
 case 70:
 YY_RULE_SETUP
-#line 243 "./util/configlexer.lex"
+#line 257 "./util/configlexer.lex"
 { YDVAR(1, VAR_FORWARD_FIRST) }
 	YY_BREAK
 case 71:
 YY_RULE_SETUP
-#line 244 "./util/configlexer.lex"
+#line 258 "./util/configlexer.lex"
 { YDVAR(1, VAR_DO_NOT_QUERY_ADDRESS) }
 	YY_BREAK
 case 72:
 YY_RULE_SETUP
-#line 245 "./util/configlexer.lex"
+#line 259 "./util/configlexer.lex"
 { YDVAR(1, VAR_DO_NOT_QUERY_LOCALHOST) }
 	YY_BREAK
 case 73:
 YY_RULE_SETUP
-#line 246 "./util/configlexer.lex"
+#line 260 "./util/configlexer.lex"
 { YDVAR(2, VAR_ACCESS_CONTROL) }
 	YY_BREAK
 case 74:
 YY_RULE_SETUP
-#line 247 "./util/configlexer.lex"
+#line 261 "./util/configlexer.lex"
 { YDVAR(1, VAR_HIDE_IDENTITY) }
 	YY_BREAK
 case 75:
 YY_RULE_SETUP
-#line 248 "./util/configlexer.lex"
+#line 262 "./util/configlexer.lex"
 { YDVAR(1, VAR_HIDE_VERSION) }
 	YY_BREAK
 case 76:
 YY_RULE_SETUP
-#line 249 "./util/configlexer.lex"
+#line 263 "./util/configlexer.lex"
 { YDVAR(1, VAR_IDENTITY) }
 	YY_BREAK
 case 77:
 YY_RULE_SETUP
-#line 250 "./util/configlexer.lex"
+#line 264 "./util/configlexer.lex"
 { YDVAR(1, VAR_VERSION) }
 	YY_BREAK
 case 78:
 YY_RULE_SETUP
-#line 251 "./util/configlexer.lex"
+#line 265 "./util/configlexer.lex"
 { YDVAR(1, VAR_MODULE_CONF) }
 	YY_BREAK
 case 79:
 YY_RULE_SETUP
-#line 252 "./util/configlexer.lex"
+#line 266 "./util/configlexer.lex"
 { YDVAR(1, VAR_DLV_ANCHOR) }
 	YY_BREAK
 case 80:
 YY_RULE_SETUP
-#line 253 "./util/configlexer.lex"
+#line 267 "./util/configlexer.lex"
 { YDVAR(1, VAR_DLV_ANCHOR_FILE) }
 	YY_BREAK
 case 81:
 YY_RULE_SETUP
-#line 254 "./util/configlexer.lex"
+#line 268 "./util/configlexer.lex"
 { YDVAR(1, VAR_TRUST_ANCHOR_FILE) }
 	YY_BREAK
 case 82:
 YY_RULE_SETUP
-#line 255 "./util/configlexer.lex"
+#line 269 "./util/configlexer.lex"
 { YDVAR(1, VAR_AUTO_TRUST_ANCHOR_FILE) }
 	YY_BREAK
 case 83:
 YY_RULE_SETUP
-#line 256 "./util/configlexer.lex"
+#line 270 "./util/configlexer.lex"
 { YDVAR(1, VAR_TRUSTED_KEYS_FILE) }
 	YY_BREAK
 case 84:
 YY_RULE_SETUP
-#line 257 "./util/configlexer.lex"
+#line 271 "./util/configlexer.lex"
 { YDVAR(1, VAR_TRUST_ANCHOR) }
 	YY_BREAK
 case 85:
 YY_RULE_SETUP
-#line 258 "./util/configlexer.lex"
+#line 272 "./util/configlexer.lex"
 { YDVAR(1, VAR_VAL_OVERRIDE_DATE) }
 	YY_BREAK
 case 86:
 YY_RULE_SETUP
-#line 259 "./util/configlexer.lex"
+#line 273 "./util/configlexer.lex"
 { YDVAR(1, VAR_VAL_SIG_SKEW_MIN) }
 	YY_BREAK
 case 87:
 YY_RULE_SETUP
-#line 260 "./util/configlexer.lex"
+#line 274 "./util/configlexer.lex"
 { YDVAR(1, VAR_VAL_SIG_SKEW_MAX) }
 	YY_BREAK
 case 88:
 YY_RULE_SETUP
-#line 261 "./util/configlexer.lex"
+#line 275 "./util/configlexer.lex"
 { YDVAR(1, VAR_BOGUS_TTL) }
 	YY_BREAK
 case 89:
 YY_RULE_SETUP
-#line 262 "./util/configlexer.lex"
+#line 276 "./util/configlexer.lex"
 { YDVAR(1, VAR_VAL_CLEAN_ADDITIONAL) }
 	YY_BREAK
 case 90:
 YY_RULE_SETUP
-#line 263 "./util/configlexer.lex"
+#line 277 "./util/configlexer.lex"
 { YDVAR(1, VAR_VAL_PERMISSIVE_MODE) }
 	YY_BREAK
 case 91:
 YY_RULE_SETUP
-#line 264 "./util/configlexer.lex"
+#line 278 "./util/configlexer.lex"
 { YDVAR(1, VAR_IGNORE_CD_FLAG) }
 	YY_BREAK
 case 92:
 YY_RULE_SETUP
-#line 265 "./util/configlexer.lex"
+#line 279 "./util/configlexer.lex"
 { YDVAR(1, VAR_VAL_LOG_LEVEL) }
 	YY_BREAK
 case 93:
 YY_RULE_SETUP
-#line 266 "./util/configlexer.lex"
+#line 280 "./util/configlexer.lex"
 { YDVAR(1, VAR_KEY_CACHE_SIZE) }
 	YY_BREAK
 case 94:
 YY_RULE_SETUP
-#line 267 "./util/configlexer.lex"
+#line 281 "./util/configlexer.lex"
 { YDVAR(1, VAR_KEY_CACHE_SLABS) }
 	YY_BREAK
 case 95:
 YY_RULE_SETUP
-#line 268 "./util/configlexer.lex"
+#line 282 "./util/configlexer.lex"
 { YDVAR(1, VAR_NEG_CACHE_SIZE) }
 	YY_BREAK
 case 96:
 YY_RULE_SETUP
-#line 269 "./util/configlexer.lex"
+#line 283 "./util/configlexer.lex"
 { 
 				  YDVAR(1, VAR_VAL_NSEC3_KEYSIZE_ITERATIONS) }
 	YY_BREAK
 case 97:
 YY_RULE_SETUP
-#line 271 "./util/configlexer.lex"
+#line 285 "./util/configlexer.lex"
 { YDVAR(1, VAR_ADD_HOLDDOWN) }
 	YY_BREAK
 case 98:
 YY_RULE_SETUP
-#line 272 "./util/configlexer.lex"
+#line 286 "./util/configlexer.lex"
 { YDVAR(1, VAR_DEL_HOLDDOWN) }
 	YY_BREAK
 case 99:
 YY_RULE_SETUP
-#line 273 "./util/configlexer.lex"
+#line 287 "./util/configlexer.lex"
 { YDVAR(1, VAR_KEEP_MISSING) }
 	YY_BREAK
 case 100:
 YY_RULE_SETUP
-#line 274 "./util/configlexer.lex"
+#line 288 "./util/configlexer.lex"
 { YDVAR(1, VAR_USE_SYSLOG) }
 	YY_BREAK
 case 101:
 YY_RULE_SETUP
-#line 275 "./util/configlexer.lex"
+#line 289 "./util/configlexer.lex"
 { YDVAR(1, VAR_LOG_TIME_ASCII) }
 	YY_BREAK
 case 102:
 YY_RULE_SETUP
-#line 276 "./util/configlexer.lex"
+#line 290 "./util/configlexer.lex"
 { YDVAR(1, VAR_LOG_QUERIES) }
 	YY_BREAK
 case 103:
 YY_RULE_SETUP
-#line 277 "./util/configlexer.lex"
+#line 291 "./util/configlexer.lex"
 { YDVAR(2, VAR_LOCAL_ZONE) }
 	YY_BREAK
 case 104:
 YY_RULE_SETUP
-#line 278 "./util/configlexer.lex"
+#line 292 "./util/configlexer.lex"
 { YDVAR(1, VAR_LOCAL_DATA) }
 	YY_BREAK
 case 105:
 YY_RULE_SETUP
-#line 279 "./util/configlexer.lex"
+#line 293 "./util/configlexer.lex"
 { YDVAR(1, VAR_LOCAL_DATA_PTR) }
 	YY_BREAK
 case 106:
 YY_RULE_SETUP
-#line 280 "./util/configlexer.lex"
+#line 294 "./util/configlexer.lex"
 { YDVAR(1, VAR_STATISTICS_INTERVAL) }
 	YY_BREAK
 case 107:
 YY_RULE_SETUP
-#line 281 "./util/configlexer.lex"
+#line 295 "./util/configlexer.lex"
 { YDVAR(1, VAR_STATISTICS_CUMULATIVE) }
 	YY_BREAK
 case 108:
 YY_RULE_SETUP
-#line 282 "./util/configlexer.lex"
+#line 296 "./util/configlexer.lex"
 { YDVAR(1, VAR_EXTENDED_STATISTICS) }
 	YY_BREAK
 case 109:
 YY_RULE_SETUP
-#line 283 "./util/configlexer.lex"
+#line 297 "./util/configlexer.lex"
 { YDVAR(0, VAR_REMOTE_CONTROL) }
 	YY_BREAK
 case 110:
 YY_RULE_SETUP
-#line 284 "./util/configlexer.lex"
+#line 298 "./util/configlexer.lex"
 { YDVAR(1, VAR_CONTROL_ENABLE) }
 	YY_BREAK
 case 111:
 YY_RULE_SETUP
-#line 285 "./util/configlexer.lex"
+#line 299 "./util/configlexer.lex"
 { YDVAR(1, VAR_CONTROL_INTERFACE) }
 	YY_BREAK
 case 112:
 YY_RULE_SETUP
-#line 286 "./util/configlexer.lex"
+#line 300 "./util/configlexer.lex"
 { YDVAR(1, VAR_CONTROL_PORT) }
 	YY_BREAK
 case 113:
 YY_RULE_SETUP
-#line 287 "./util/configlexer.lex"
+#line 301 "./util/configlexer.lex"
 { YDVAR(1, VAR_SERVER_KEY_FILE) }
 	YY_BREAK
 case 114:
 YY_RULE_SETUP
-#line 288 "./util/configlexer.lex"
+#line 302 "./util/configlexer.lex"
 { YDVAR(1, VAR_SERVER_CERT_FILE) }
 	YY_BREAK
 case 115:
 YY_RULE_SETUP
-#line 289 "./util/configlexer.lex"
+#line 303 "./util/configlexer.lex"
 { YDVAR(1, VAR_CONTROL_KEY_FILE) }
 	YY_BREAK
 case 116:
 YY_RULE_SETUP
-#line 290 "./util/configlexer.lex"
+#line 304 "./util/configlexer.lex"
 { YDVAR(1, VAR_CONTROL_CERT_FILE) }
 	YY_BREAK
 case 117:
 YY_RULE_SETUP
-#line 291 "./util/configlexer.lex"
+#line 305 "./util/configlexer.lex"
 { YDVAR(1, VAR_PYTHON_SCRIPT) }
 	YY_BREAK
 case 118:
 YY_RULE_SETUP
-#line 292 "./util/configlexer.lex"
+#line 306 "./util/configlexer.lex"
 { YDVAR(0, VAR_PYTHON) }
 	YY_BREAK
 case 119:
 YY_RULE_SETUP
-#line 293 "./util/configlexer.lex"
+#line 307 "./util/configlexer.lex"
 { YDVAR(1, VAR_DOMAIN_INSECURE) }
 	YY_BREAK
 case 120:
 YY_RULE_SETUP
-#line 294 "./util/configlexer.lex"
+#line 308 "./util/configlexer.lex"
 { YDVAR(1, VAR_MINIMAL_RESPONSES) }
 	YY_BREAK
 case 121:
 YY_RULE_SETUP
-#line 295 "./util/configlexer.lex"
+#line 309 "./util/configlexer.lex"
 { YDVAR(1, VAR_RRSET_ROUNDROBIN) }
 	YY_BREAK
 case 122:
 YY_RULE_SETUP
-#line 296 "./util/configlexer.lex"
+#line 310 "./util/configlexer.lex"
 { YDVAR(1, VAR_MAX_UDP_SIZE) }
 	YY_BREAK
 case 123:
 /* rule 123 can match eol */
 YY_RULE_SETUP
-#line 297 "./util/configlexer.lex"
+#line 311 "./util/configlexer.lex"
 { LEXOUT(("NL\n")); cfg_parser->line++; }
 	YY_BREAK
 /* Quoted strings. Strip leading and ending quotes */
 case 124:
 YY_RULE_SETUP
-#line 300 "./util/configlexer.lex"
+#line 314 "./util/configlexer.lex"
 { BEGIN(quotedstring); LEXOUT(("QS ")); }
 	YY_BREAK
 case YY_STATE_EOF(quotedstring):
-#line 301 "./util/configlexer.lex"
+#line 315 "./util/configlexer.lex"
 {
         yyerror("EOF inside quoted string");
 	if(--num_args == 0) { BEGIN(INITIAL); }
@@ -2568,19 +2582,19 @@ case YY_STATE_EOF(quotedstring):
 	YY_BREAK
 case 125:
 YY_RULE_SETUP
-#line 306 "./util/configlexer.lex"
+#line 320 "./util/configlexer.lex"
 { LEXOUT(("STR(%s) ", yytext)); yymore(); }
 	YY_BREAK
 case 126:
 /* rule 126 can match eol */
 YY_RULE_SETUP
-#line 307 "./util/configlexer.lex"
+#line 321 "./util/configlexer.lex"
 { yyerror("newline inside quoted string, no end \""); 
 			  cfg_parser->line++; BEGIN(INITIAL); }
 	YY_BREAK
 case 127:
 YY_RULE_SETUP
-#line 309 "./util/configlexer.lex"
+#line 323 "./util/configlexer.lex"
 {
         LEXOUT(("QE "));
 	if(--num_args == 0) { BEGIN(INITIAL); }
@@ -2595,11 +2609,11 @@ YY_RULE_SETUP
 /* Single Quoted strings. Strip leading and ending quotes */
 case 128:
 YY_RULE_SETUP
-#line 321 "./util/configlexer.lex"
+#line 335 "./util/configlexer.lex"
 { BEGIN(singlequotedstr); LEXOUT(("SQS ")); }
 	YY_BREAK
 case YY_STATE_EOF(singlequotedstr):
-#line 322 "./util/configlexer.lex"
+#line 336 "./util/configlexer.lex"
 {
         yyerror("EOF inside quoted string");
 	if(--num_args == 0) { BEGIN(INITIAL); }
@@ -2608,19 +2622,19 @@ case YY_STATE_EOF(singlequotedstr):
 	YY_BREAK
 case 129:
 YY_RULE_SETUP
-#line 327 "./util/configlexer.lex"
+#line 341 "./util/configlexer.lex"
 { LEXOUT(("STR(%s) ", yytext)); yymore(); }
 	YY_BREAK
 case 130:
 /* rule 130 can match eol */
 YY_RULE_SETUP
-#line 328 "./util/configlexer.lex"
+#line 342 "./util/configlexer.lex"
 { yyerror("newline inside quoted string, no end '"); 
 			     cfg_parser->line++; BEGIN(INITIAL); }
 	YY_BREAK
 case 131:
 YY_RULE_SETUP
-#line 330 "./util/configlexer.lex"
+#line 344 "./util/configlexer.lex"
 {
         LEXOUT(("SQE "));
 	if(--num_args == 0) { BEGIN(INITIAL); }
@@ -2635,12 +2649,12 @@ YY_RULE_SETUP
 /* include: directive */
 case 132:
 YY_RULE_SETUP
-#line 342 "./util/configlexer.lex"
+#line 356 "./util/configlexer.lex"
 { 
 	LEXOUT(("v(%s) ", yytext)); inc_prev = YYSTATE; BEGIN(include); }
 	YY_BREAK
 case YY_STATE_EOF(include):
-#line 344 "./util/configlexer.lex"
+#line 358 "./util/configlexer.lex"
 {
         yyerror("EOF inside include directive");
         BEGIN(inc_prev);
@@ -2648,23 +2662,23 @@ case YY_STATE_EOF(include):
 	YY_BREAK
 case 133:
 YY_RULE_SETUP
-#line 348 "./util/configlexer.lex"
+#line 362 "./util/configlexer.lex"
 { LEXOUT(("ISP ")); /* ignore */ }
 	YY_BREAK
 case 134:
 /* rule 134 can match eol */
 YY_RULE_SETUP
-#line 349 "./util/configlexer.lex"
+#line 363 "./util/configlexer.lex"
 { LEXOUT(("NL\n")); cfg_parser->line++;}
 	YY_BREAK
 case 135:
 YY_RULE_SETUP
-#line 350 "./util/configlexer.lex"
+#line 364 "./util/configlexer.lex"
 { LEXOUT(("IQS ")); BEGIN(include_quoted); }
 	YY_BREAK
 case 136:
 YY_RULE_SETUP
-#line 351 "./util/configlexer.lex"
+#line 365 "./util/configlexer.lex"
 {
 	LEXOUT(("Iunquotedstr(%s) ", yytext));
 	config_start_include_glob(yytext);
@@ -2672,7 +2686,7 @@ YY_RULE_SETUP
 }
 	YY_BREAK
 case YY_STATE_EOF(include_quoted):
-#line 356 "./util/configlexer.lex"
+#line 370 "./util/configlexer.lex"
 {
         yyerror("EOF inside quoted string");
         BEGIN(inc_prev);
@@ -2680,19 +2694,19 @@ case YY_STATE_EOF(include_quoted):
 	YY_BREAK
 case 137:
 YY_RULE_SETUP
-#line 360 "./util/configlexer.lex"
+#line 374 "./util/configlexer.lex"
 { LEXOUT(("ISTR(%s) ", yytext)); yymore(); }
 	YY_BREAK
 case 138:
 /* rule 138 can match eol */
 YY_RULE_SETUP
-#line 361 "./util/configlexer.lex"
+#line 375 "./util/configlexer.lex"
 { yyerror("newline before \" in include name"); 
 				  cfg_parser->line++; BEGIN(inc_prev); }
 	YY_BREAK
 case 139:
 YY_RULE_SETUP
-#line 363 "./util/configlexer.lex"
+#line 377 "./util/configlexer.lex"
 {
 	LEXOUT(("IQE "));
 	yytext[yyleng - 1] = '\0';
@@ -2702,10 +2716,11 @@ YY_RULE_SETUP
 	YY_BREAK
 case YY_STATE_EOF(INITIAL):
 case YY_STATE_EOF(val):
-#line 369 "./util/configlexer.lex"
+#line 383 "./util/configlexer.lex"
 {
+	LEXOUT(("LEXEOF "));
 	yy_set_bol(1); /* Set beginning of line, so "^" rules match.  */
-	if (config_include_stack_ptr == 0) {
+	if (!config_include_stack) {
 		yyterminate();
 	} else {
 		fclose(yyin);
@@ -2715,31 +2730,31 @@ case YY_STATE_EOF(val):
 	YY_BREAK
 case 140:
 YY_RULE_SETUP
-#line 379 "./util/configlexer.lex"
+#line 394 "./util/configlexer.lex"
 { LEXOUT(("unquotedstr(%s) ", yytext)); 
 			if(--num_args == 0) { BEGIN(INITIAL); }
 			yylval.str = strdup(yytext); return STRING_ARG; }
 	YY_BREAK
 case 141:
 YY_RULE_SETUP
-#line 383 "./util/configlexer.lex"
+#line 398 "./util/configlexer.lex"
 {
 	ub_c_error_msg("unknown keyword '%s'", yytext);
 	}
 	YY_BREAK
 case 142:
 YY_RULE_SETUP
-#line 387 "./util/configlexer.lex"
+#line 402 "./util/configlexer.lex"
 {
 	ub_c_error_msg("stray '%s'", yytext);
 	}
 	YY_BREAK
 case 143:
 YY_RULE_SETUP
-#line 391 "./util/configlexer.lex"
+#line 406 "./util/configlexer.lex"
 ECHO;
 	YY_BREAK
-#line 2741 "<stdout>"
+#line 2756 "<stdout>"
 
 	case YY_END_OF_BUFFER:
 		{
@@ -3694,7 +3709,7 @@ void yyfree (void * ptr )
 
 #define YYTABLES_NAME "yytables"
 
-#line 391 "./util/configlexer.lex"
+#line 406 "./util/configlexer.lex"
 
 
 
diff --git a/util/configlexer.lex b/util/configlexer.lex
index 97deab189..b4fc86889 100644
--- a/util/configlexer.lex
+++ b/util/configlexer.lex
@@ -39,43 +39,54 @@ void ub_c_error(const char *message);
 struct inc_state {
 	char* filename;
 	int line;
+	YY_BUFFER_STATE buffer;
+	struct inc_state* next;
 };
-static struct inc_state parse_stack[MAXINCLUDES];
-static YY_BUFFER_STATE include_stack[MAXINCLUDES];
-static int config_include_stack_ptr = 0;
+static struct inc_state* config_include_stack = NULL;
 static int inc_prev = 0;
 static int num_args = 0;
 
-
 static void config_start_include(const char* filename)
 {
 	FILE *input;
+	struct inc_state* s;
+	char* nm;
 	if(strlen(filename) == 0) {
 		ub_c_error_msg("empty include file name");
 		return;
 	}
-	if(config_include_stack_ptr >= MAXINCLUDES) {
-		ub_c_error_msg("includes nested too deeply, skipped (>%d)", MAXINCLUDES);
+	s = (struct inc_state*)malloc(sizeof(*s));
+	if(!s) {
+		ub_c_error_msg("include %s: malloc failure", filename);
 		return;
 	}
 	if(cfg_parser->chroot && strncmp(filename, cfg_parser->chroot,
 		strlen(cfg_parser->chroot)) == 0) {
 		filename += strlen(cfg_parser->chroot);
 	}
+	nm = strdup(filename);
+	if(!nm) {
+		ub_c_error_msg("include %s: malloc failure", filename);
+		free(s);
+		return;
+	}
 	input = fopen(filename, "r");
 	if(!input) {
 		ub_c_error_msg("cannot open include file '%s': %s",
 			filename, strerror(errno));
+		free(s);
+		free(nm);
 		return;
 	}
-	LEXOUT(("switch_to_include_file(%s) ", filename));
-	parse_stack[config_include_stack_ptr].filename = cfg_parser->filename;
-	parse_stack[config_include_stack_ptr].line = cfg_parser->line;
-	include_stack[config_include_stack_ptr] = YY_CURRENT_BUFFER;
-	cfg_parser->filename = strdup(filename);
+	LEXOUT(("switch_to_include_file(%s)\n", filename));
+	s->filename = cfg_parser->filename;
+	s->line = cfg_parser->line;
+	s->buffer = YY_CURRENT_BUFFER;
+	s->next = config_include_stack;
+	config_include_stack = s;
+	cfg_parser->filename = nm;
 	cfg_parser->line = 1;
 	yy_switch_to_buffer(yy_create_buffer(input, YY_BUF_SIZE));
-	++config_include_stack_ptr;
 }
 
 static void config_start_include_glob(const char* filename)
@@ -126,12 +137,15 @@ static void config_start_include_glob(const char* filename)
 
 static void config_end_include(void)
 {
-	--config_include_stack_ptr;
+	struct inc_state* s = config_include_stack;
+	if(!s) return;
 	free(cfg_parser->filename);
-	cfg_parser->filename = parse_stack[config_include_stack_ptr].filename;
-	cfg_parser->line = parse_stack[config_include_stack_ptr].line;
+	cfg_parser->filename = s->filename;
+	cfg_parser->line = s->line;
 	yy_delete_buffer(YY_CURRENT_BUFFER);
-	yy_switch_to_buffer(include_stack[config_include_stack_ptr]);
+	yy_switch_to_buffer(s->buffer);
+	config_include_stack = s->next;
+	free(s);
 }
 
 #ifndef yy_set_bol /* compat definition, for flex 2.4.6 */
@@ -367,8 +381,9 @@ max-udp-size{COLON}		{ YDVAR(1, VAR_MAX_UDP_SIZE) }
 	BEGIN(inc_prev);
 }
 <INITIAL,val><<EOF>>	{
+	LEXOUT(("LEXEOF "));
 	yy_set_bol(1); /* Set beginning of line, so "^" rules match.  */
-	if (config_include_stack_ptr == 0) {
+	if (!config_include_stack) {
 		yyterminate();
 	} else {
 		fclose(yyin);