diff --git a/ripd/ripd.h b/ripd/ripd.h
index c414c76..dc2f64d 100644
--- a/ripd/ripd.h
+++ b/ripd/ripd.h
@@ -374,6 +374,8 @@
 void rip_zclient_start ();
 void rip_zclient_reset ();
 void rip_offset_init ();
+int if_check_address (struct in_addr addr);
+int if_valid_neighbor (struct in_addr addr);
 
 int rip_request_send (struct sockaddr_in *, struct interface *, u_char);
 int rip_neighbor_lookup (struct sockaddr_in *);