diff --git a/Shorewall/Perl/Shorewall/Chains.pm b/Shorewall/Perl/Shorewall/Chains.pm
index b7dd104f2..0d6f6f6a5 100644
--- a/Shorewall/Perl/Shorewall/Chains.pm
+++ b/Shorewall/Perl/Shorewall/Chains.pm
@@ -3396,7 +3396,7 @@ sub delete_duplicates {
 		    next RULE unless compare_values( $baseref->{$key}, $ruleref->{$key} );
 		}
 
-		$duplicate = 1;
+		$duplicate = $ruleref->{mode} == CAT_MODE;;
 	    }
 
 	    if ( $duplicate ) {