diff --git a/Shorewall/Perl/Shorewall/Zones.pm b/Shorewall/Perl/Shorewall/Zones.pm
index 4e74b478f..37ba14e67 100644
--- a/Shorewall/Perl/Shorewall/Zones.pm
+++ b/Shorewall/Perl/Shorewall/Zones.pm
@@ -891,7 +891,7 @@ sub firewall_zone() {
 # Determine if the passed physical device is a bridge
 #
 sub is_a_bridge( $ ) {
-    qt which 'brctl' && qt( "brctl show | tail -n+2 | grep -q '^$_[0]\[\[:space:\]\]'" );
+    which 'brctl' && qt( "brctl show | tail -n+2 | grep -q '^$_[0]\[\[:space:\]\]'" );
 }
 
 #