diff --git a/Shorewall2/firewall b/Shorewall2/firewall
index 6795046ad..d248f58f3 100755
--- a/Shorewall2/firewall
+++ b/Shorewall2/firewall
@@ -1791,7 +1791,7 @@ setup_netmap() {
 		addnatrule $(input_chain $interface)  -d $net1 -j NETMAP --to $net2
 		;;
 	    SNAT)
-		addnatrule $(output_chain $interface) -d $net1 -j NETMAP --to $net2
+		addnatrule $(output_chain $interface) -s $net1 -j NETMAP --to $net2
 		;;
 	    *)
 		fatal_error "Unvalid type $type in entry \"$type $net1 $interface $net2\""