diff --git a/bgpd/bgp_community.h b/bgpd/bgp_community.h
index 898ca9e..016b0f6 100644
--- a/bgpd/bgp_community.h
+++ b/bgpd/bgp_community.h
@@ -56,9 +56,9 @@
 void community_unintern (struct community *);
 char *community_str (struct community *);
 unsigned int community_hash_make (struct community *);
-struct community *community_str2com (char *);
-int community_match (struct community *, struct community *);
-int community_cmp (struct community *, 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 *);