diff --git a/sys/netinet/siftr.c b/sys/netinet/siftr.c
--- a/sys/netinet/siftr.c
+++ b/sys/netinet/siftr.c
@@ -1128,8 +1128,7 @@
 		INP_RUNLOCK(inp);
 
 ret6:
-	/* Returning 0 ensures pfil will not discard the pkt. */
-	return (0);
+	return (PFIL_PASS);
 }
 #endif /* #ifdef SIFTR_IPV6 */