diff --git a/parser/parser_alias.c b/parser/parser_alias.c
index f5b6da4ee..b96d18f87 100644
--- a/parser/parser_alias.c
+++ b/parser/parser_alias.c
@@ -25,6 +25,8 @@
 #include "parser.h"
 #include "profile.h"
 
+typedef int (*comparison_fn_t)(const void *, const void *);
+
 struct alias_rule {
 	char *from;
 	char *to;
diff --git a/parser/parser_symtab.c b/parser/parser_symtab.c
index 3e667d87a..7b8f211b7 100644
--- a/parser/parser_symtab.c
+++ b/parser/parser_symtab.c
@@ -25,6 +25,9 @@
 #include "immunix.h"
 #include "parser.h"
 
+typedef int (*comparison_fn_t)(const void *, const void *);
+typedef void (*__free_fn_t)(void *);
+
 enum var_type {
 	sd_boolean,
 	sd_set,