diff --git a/sys/netinet6/nd6.h b/sys/netinet6/nd6.h
index a11ec511629d..af8f69ad7075 100644
--- a/sys/netinet6/nd6.h
+++ b/sys/netinet6/nd6.h
@@ -441,7 +441,6 @@ void nd6_dad_stop(struct ifaddr *);
 /* nd6_rtr.c */
 void nd6_rs_input(struct mbuf *, int, int);
 void nd6_ra_input(struct mbuf *, int, int);
-void prelist_del(struct nd_prefix *);
 void defrouter_reset(void);
 void defrouter_select(void);
 void defrtrlist_del(struct nd_defrouter *);