diff --git a/sys/netinet6/nd6.c b/sys/netinet6/nd6.c
index 4adc54591338..c2e6d66798e6 100644
--- a/sys/netinet6/nd6.c
+++ b/sys/netinet6/nd6.c
@@ -1795,6 +1795,8 @@ nd6_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp)
 		LIST_FOREACH_SAFE(pr, &V_nd_prefix, ndpr_entry, next) {
 			if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
 				continue; /* XXX */
+			if (LIST_EMPTY(&pr->ndpr_advrtrs))
+				continue;
 			nd6_prefix_unlink(pr, &prl);
 		}
 		ND6_WUNLOCK();