diff --git a/sys/netpfil/ipfw/ip_fw_nat.c b/sys/netpfil/ipfw/ip_fw_nat.c
index d7b31c29d4e..22e6d81886a 100644
--- a/sys/netpfil/ipfw/ip_fw_nat.c
+++ b/sys/netpfil/ipfw/ip_fw_nat.c
@@ -348,6 +348,9 @@ ipfw_nat(struct ip_fw_args *args, struct cfg_nat *t, struct mbuf *m)
 
 	c = mtod(mcl, char *);
 
+	if (V_sync_alias)
+		V_sync_alias(NULL, NULL);
+
 	/* Check if this is 'global' instance */
 	if (t == NULL) {
 		if (args->flags & IPFW_ARGS_IN) {