--- a/servo/components/style/gecko/non_ts_pseudo_class_list.rs
+++ b/servo/components/style/gecko/non_ts_pseudo_class_list.rs
@@ -112,14 +112,14 @@ macro_rules! apply_non_ts_list {
             ],
             string: [
                 ("-moz-system-metric", MozSystemMetric, mozSystemMetric, _, PSEUDO_CLASS_INTERNAL),
                 ("-moz-empty-except-children-with-localname", MozEmptyExceptChildrenWithLocalname,
                  mozEmptyExceptChildrenWithLocalname, _, PSEUDO_CLASS_INTERNAL),
                 ("lang", Lang, lang, _, _),
             ],
             keyword: [
-                ("-moz-locale-dir", MozLocaleDir, mozLocaleDir, _, PSEUDO_CLASS_INTERNAL),
+                ("-moz-locale-dir", MozLocaleDir, mozLocaleDir, _, _),
                 ("dir", Dir, dir, _, _),
             ]
         }
     }
 }