diff --git a/Shorewall-perl/Shorewall/Chains.pm b/Shorewall-perl/Shorewall/Chains.pm
index b8f8b1631..35145b2d4 100644
--- a/Shorewall-perl/Shorewall/Chains.pm
+++ b/Shorewall-perl/Shorewall/Chains.pm
@@ -1234,7 +1234,7 @@ sub do_tos( $ ) {
 #
 sub match_source_dev( $ ) {
     my $interface = shift;
-    my $interfaceref =  find_interface( $interface );
+    my $interfaceref =  known_interface( $interface );
     if ( $interfaceref && $interfaceref->{options}{port} ) {
 	"-i $interfaceref->{bridge} -m physdev --physdev-in $interface ";
     } else {
@@ -1247,7 +1247,7 @@ sub match_source_dev( $ ) {
 #
 sub match_dest_dev( $ ) {
     my $interface = shift;
-    my $interfaceref =  find_interface( $interface );
+    my $interfaceref =  known_interface( $interface );
     if ( $interfaceref && $interfaceref->{options}{port} ) {
 	if ( $capabilities{PHYSDEV_BRIDGE} ) {
 	    "-o $interfaceref->{bridge} -m physdev --physdev-is-bridged --physdev-out $interface ";