diff --git a/bgpd/bgp_aspath.h b/bgpd/bgp_aspath.h
index bf23e5d..5400c57 100644
--- a/bgpd/bgp_aspath.h
+++ b/bgpd/bgp_aspath.h
@@ -87,6 +87,7 @@
 extern unsigned int aspath_count_hops (struct aspath *);
 extern unsigned int aspath_count_confeds (struct aspath *);
 extern unsigned int aspath_size (struct aspath *);
+extern as_t aspath_highest (struct aspath *);
 extern void aspath_put (struct stream *, struct aspath *);
 
 /* For SNMP BGP4PATHATTRASPATHSEGMENT, might be useful for debug */