diff --git a/sys/netinet6/scope6_var.h b/sys/netinet6/scope6_var.h
index 55e0c8eda53b..8ec6f1051814 100644
--- a/sys/netinet6/scope6_var.h
+++ b/sys/netinet6/scope6_var.h
@@ -49,7 +49,6 @@ int	scope6_set __P((struct ifnet *, struct scope6_id *));
 int	scope6_get __P((struct ifnet *, struct scope6_id *));
 void	scope6_setdefault __P((struct ifnet *));
 int	scope6_get_default __P((struct scope6_id *));
-u_int32_t scope6_in6_addrscope __P((struct in6_addr *));
 u_int32_t scope6_addr2default __P((struct in6_addr *));
 int	sa6_embedscope __P((struct sockaddr_in6 *, int));
 int	sa6_recoverscope __P((struct sockaddr_in6 *));