diff --git a/sys/net/if_ethersubr.c b/sys/net/if_ethersubr.c
index eada2f90c7ee..2b3f7465032f 100644
--- a/sys/net/if_ethersubr.c
+++ b/sys/net/if_ethersubr.c
@@ -310,7 +310,8 @@ ether_output(struct ifnet *ifp, struct mbuf *m,
 	 * on the wire). However, we don't do that here for security
 	 * reasons and compatibility with the original behavior.
 	 */
-	if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) {
+	if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1) &&
+	    m_tag_find(m, PACKET_TAG_PF_ROUTED, NULL) == NULL) {
 		int csum_flags = 0;
 
 		if (m->m_pkthdr.csum_flags & CSUM_IP)