diff --git a/sys/netinet/in_rmx.c b/sys/netinet/in_rmx.c
index 96406aa45cfb..1389873eb802 100644
--- a/sys/netinet/in_rmx.c
+++ b/sys/netinet/in_rmx.c
@@ -121,12 +121,13 @@ in_matroute(void *v_arg, struct radix_node_head *head)
 	struct radix_node *rn = rn_match(v_arg, head);
 	struct rtentry *rt = (struct rtentry *)rn;
 
-	/*XXX locking? */
-	if (rt && rt->rt_refcnt == 0) {		/* this is first reference */
+	if (rt) {
+		RT_LOCK(rt);
 		if (rt->rt_flags & RTPRF_OURS) {
 			rt->rt_flags &= ~RTPRF_OURS;
 			rt->rt_rmx.rmx_expire = 0;
 		}
+		RT_UNLOCK(rt);
 	}
 	return rn;
 }
diff --git a/sys/netinet6/in6_rmx.c b/sys/netinet6/in6_rmx.c
index 8927a176df92..2a1364673b31 100644
--- a/sys/netinet6/in6_rmx.c
+++ b/sys/netinet6/in6_rmx.c
@@ -193,11 +193,13 @@ in6_matroute(void *v_arg, struct radix_node_head *head)
 	struct radix_node *rn = rn_match(v_arg, head);
 	struct rtentry *rt = (struct rtentry *)rn;
 
-	if (rt && rt->rt_refcnt == 0) { /* this is first reference */
+	if (rt) {
+		RT_LOCK(rt);
 		if (rt->rt_flags & RTPRF_OURS) {
 			rt->rt_flags &= ~RTPRF_OURS;
 			rt->rt_rmx.rmx_expire = 0;
 		}
+		RT_UNLOCK(rt);
 	}
 	return rn;
 }