diff --git a/Shorewall/firewall b/Shorewall/firewall
index 11d271a55..4f4518141 100755
--- a/Shorewall/firewall
+++ b/Shorewall/firewall
@@ -3021,8 +3021,7 @@ setup_nat() {
     do_one_nat() {
 	local add_ip_aliases=$ADD_IP_ALIASES iface=${interface%:*}
 
-	if [ -n "$
-	_aliases" ]; then
+	if [ -n "$add_ip_aliases" ]; then
 	    case $interface in
 		*:)
 		    interface=${interface%:}