diff --git a/Shorewall/Perl/Shorewall/Config.pm b/Shorewall/Perl/Shorewall/Config.pm
index 0a2d37f5f..0590ba21c 100644
--- a/Shorewall/Perl/Shorewall/Config.pm
+++ b/Shorewall/Perl/Shorewall/Config.pm
@@ -2083,7 +2083,7 @@ sub check_trivalue( $$ ) {
 	    fatal_error "Invalid value ($val) for $var";
 	}
     } else {
-	$config{var} = $default
+	$config{$var} = $default
     }
 }