diff --git a/bgpd/bgp_ecommunity.h b/bgpd/bgp_ecommunity.h
index e7be786..56e9f18 100644
--- a/bgpd/bgp_ecommunity.h
+++ b/bgpd/bgp_ecommunity.h
@@ -68,10 +68,10 @@
 struct ecommunity *ecommunity_dup (struct ecommunity *);
 struct ecommunity *ecommunity_merge (struct ecommunity *, struct ecommunity *);
 struct ecommunity *ecommunity_intern (struct ecommunity *);
-int ecommunity_cmp (struct ecommunity *, struct ecommunity *);
+int ecommunity_cmp (const struct ecommunity *, const struct ecommunity *);
 void ecommunity_unintern (struct ecommunity *);
 unsigned int ecommunity_hash_make (struct ecommunity *);
-struct ecommunity *ecommunity_str2com (char *, int, int);
+struct ecommunity *ecommunity_str2com (const char *, int, int);
 char *ecommunity_ecom2str (struct ecommunity *, int);
-int ecommunity_match (struct ecommunity *, struct ecommunity *);
+int ecommunity_match (const struct ecommunity *, const struct ecommunity *);
 char *ecommunity_str (struct ecommunity *);