diff --git a/Shorewall/Perl/Shorewall/Zones.pm b/Shorewall/Perl/Shorewall/Zones.pm
index 423921884..6ff384e99 100644
--- a/Shorewall/Perl/Shorewall/Zones.pm
+++ b/Shorewall/Perl/Shorewall/Zones.pm
@@ -934,7 +934,7 @@ sub process_interface( $$ ) {
 	    return;
 	}
 
-	fatal_error "Invalid FORMAT ($1)";
+	fatal_error "Invalid FORMAT ($originalinterface)";
     }
 
     if ( $zone eq '-' ) {