diff --git a/servers/slapd/back-bdb/error.c b/servers/slapd/back-bdb/error.c
index d324ec5f46..4d2f22277a 100644
--- a/servers/slapd/back-bdb/error.c
+++ b/servers/slapd/back-bdb/error.c
@@ -25,7 +25,7 @@
 #if DB_VERSION_FULL < 0x04030000
 void bdb_errcall( const char *pfx, char * msg )
 #else
-void bdb_errcall( DB_ENV *env, const char *pfx, const char * msg )
+void bdb_errcall( const DB_ENV *env, const char *pfx, const char * msg )
 #endif
 {
 #ifdef HAVE_EBCDIC
diff --git a/servers/slapd/back-bdb/proto-bdb.h b/servers/slapd/back-bdb/proto-bdb.h
index 6f264720f4..cb2db5644a 100644
--- a/servers/slapd/back-bdb/proto-bdb.h
+++ b/servers/slapd/back-bdb/proto-bdb.h
@@ -142,7 +142,7 @@ int bdb_fix_dn( Entry *e, int checkit );
 #if DB_VERSION_FULL < 0x04030000
 void bdb_errcall( const char *pfx, char * msg );
 #else
-void bdb_errcall( DB_ENV *env, const char *pfx, const char * msg );
+void bdb_errcall( const DB_ENV *env, const char *pfx, const char * msg );
 #endif
 
 #ifdef HAVE_EBCDIC