diff --git a/lib/if.h b/lib/if.h
index 3896d18..55337fc 100644
--- a/lib/if.h
+++ b/lib/if.h
@@ -202,6 +202,7 @@
 void connected_free (struct connected *);
 void connected_add (struct interface *, struct connected *);
 struct connected  *connected_delete_by_prefix (struct interface *, struct prefix *);
+struct connected  *connected_lookup_address (struct interface *, struct in_addr);
 int ifc_pointopoint (struct connected *);
 
 #ifndef HAVE_IF_NAMETOINDEX