diff --git a/bgpd/bgp_community.h b/bgpd/bgp_community.h
index 21a9419..aed7f33 100644
--- a/bgpd/bgp_community.h
+++ b/bgpd/bgp_community.h
@@ -51,23 +51,23 @@
 #define com_nthval(X,n)  ((X)->val + (n))
 
 /* Prototypes of communities attribute functions.  */
-void community_init ();
-void community_free (struct community *);
-struct community *community_uniq_sort (struct community *);
-struct community *community_parse (u_int32_t *, u_short);
-struct community *community_intern (struct community *);
-void community_unintern (struct community *);
-char *community_str (struct community *);
-unsigned int community_hash_make (struct community *);
-struct community *community_str2com (const char *);
-int community_match (const struct community *, const struct community *);
-int community_cmp (const struct community *, const struct community *);
-struct community *community_merge (struct community *, struct community *);
-struct community *community_delete (struct community *, struct community *);
-struct community *community_dup (struct community *);
-int community_include (struct community *, u_int32_t);
-void community_del_val (struct community *, u_int32_t *);
-unsigned long community_count ();
-struct hash *community_hash ();
+extern void community_init (void);
+extern void community_free (struct community *);
+extern struct community *community_uniq_sort (struct community *);
+extern struct community *community_parse (u_int32_t *, u_short);
+extern struct community *community_intern (struct community *);
+extern void community_unintern (struct community *);
+extern char *community_str (struct community *);
+extern unsigned int community_hash_make (struct community *);
+extern struct community *community_str2com (const char *);
+extern int community_match (const struct community *, const struct community *);
+extern int community_cmp (const struct community *, const struct community *);
+extern struct community *community_merge (struct community *, struct community *);
+extern struct community *community_delete (struct community *, struct community *);
+extern struct community *community_dup (struct community *);
+extern int community_include (struct community *, u_int32_t);
+extern void community_del_val (struct community *, u_int32_t *);
+extern unsigned long community_count (void);
+extern struct hash *community_hash (void);
 
 #endif /* _QUAGGA_BGP_COMMUNITY_H */