diff --git a/sys/netpfil/ipfw/ip_fw_nat.c b/sys/netpfil/ipfw/ip_fw_nat.c
index d7b31c29d4e..a25ecec65a6 100644
--- a/sys/netpfil/ipfw/ip_fw_nat.c
+++ b/sys/netpfil/ipfw/ip_fw_nat.c
@@ -81,22 +81,6 @@ struct cfg_redir {
 	LIST_HEAD(spool_chain, cfg_spool) spool_chain;
 };
 
-/* Nat configuration data struct. */
-struct cfg_nat {
-	/* chain of nat instances */
-	LIST_ENTRY(cfg_nat)	_next;
-	int			id;		/* nat id  */
-	struct in_addr		ip;		/* nat ip address */
-	struct libalias		*lib;		/* libalias instance */
-	int			mode;		/* aliasing mode */
-	int			redir_cnt; /* number of entry in spool chain */
-	/* chain of redir instances */
-	LIST_HEAD(redir_chain, cfg_redir) redir_chain;  
-	char			if_name[IF_NAMESIZE];	/* interface name */
-	u_short			alias_port_lo;	/* low range for port aliasing */
-	u_short			alias_port_hi;	/* high range for port aliasing */
-};
-
 static eventhandler_tag ifaddr_event_tag;
 
 static void
@@ -348,6 +332,9 @@ 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(t, NULL);
+
 	/* Check if this is 'global' instance */
 	if (t == NULL) {
 		if (args->flags & IPFW_ARGS_IN) {