diff --git a/contrib/fastrpz.patch b/contrib/fastrpz.patch
index b80eeb2bb..8f079f272 100644
--- a/contrib/fastrpz.patch
+++ b/contrib/fastrpz.patch
@@ -3269,7 +3269,7 @@ Index: unbound-1.7.0~rc1/util/configparser.y
 +
 +		OUTYY(("P(rpz_zone:%s)\n", $2));
 +		old_cstr = cfg_parser->cfg->rpz_cstr;
-+		asprintf(&new_cstr, "%s\nzone %s", old_cstr?old_cstr:"", $2);
++		(void)asprintf(&new_cstr, "%s\nzone %s", old_cstr?old_cstr:"", $2);
 +		if(!new_cstr)
 +			yyerror("out of memory");
 +		free(old_cstr);
@@ -3282,7 +3282,7 @@ Index: unbound-1.7.0~rc1/util/configparser.y
 +
 +		OUTYY(("P(rpz_option:%s)\n", $2));
 +		old_cstr = cfg_parser->cfg->rpz_cstr;
-+		asprintf(&new_cstr, "%s\n%s", old_cstr ? old_cstr : "", $2);
++		(void)asprintf(&new_cstr, "%s\n%s", old_cstr ? old_cstr : "", $2);
 +		if(!new_cstr)
 +			yyerror("out of memory");
 +		free(old_cstr);
diff --git a/doc/Changelog b/doc/Changelog
index 279a44e15..883c32870 100644
--- a/doc/Changelog
+++ b/doc/Changelog
@@ -1,3 +1,7 @@
+11 September 2018: Wouter
+	- Fixed unused return value warnings in contrib/fastrpz.patch for
+	  asprintf.
+
 10 September 2018: Wouter
 	- 1.8.1 in svn trunk. (changes from 4,5,.. sep apply).
 	- iana port update.