--- a/servo/components/style/gecko/non_ts_pseudo_class_list.rs
+++ b/servo/components/style/gecko/non_ts_pseudo_class_list.rs
@@ -111,19 +111,19 @@ macro_rules! apply_non_ts_list {
                 ("-moz-is-html", MozIsHTML, mozIsHTML, _, _),
                 ("-moz-placeholder", MozPlaceholder, mozPlaceholder, _, _),
                 ("-moz-lwtheme", MozLWTheme, mozLWTheme, _, _),
                 ("-moz-lwtheme-brighttext", MozLWThemeBrightText, mozLWThemeBrightText, _, _),
                 ("-moz-lwtheme-darktext", MozLWThemeDarkText, mozLWThemeDarkText, _, _),
                 ("-moz-window-inactive", MozWindowInactive, mozWindowInactive, _, _),
             ],
             string: [
-                ("-moz-system-metric", MozSystemMetric, mozSystemMetric, _, PSEUDO_CLASS_ENABLED_IN_UA_SHEETS),
+                ("-moz-system-metric", MozSystemMetric, mozSystemMetric, _, _),
                 ("-moz-empty-except-children-with-localname", MozEmptyExceptChildrenWithLocalname,
-                 mozEmptyExceptChildrenWithLocalname, _, PSEUDO_CLASS_ENABLED_IN_UA_SHEETS),
+                 mozEmptyExceptChildrenWithLocalname, _, _),
                 ("lang", Lang, lang, _, _),
             ],
             keyword: [
                 ("-moz-locale-dir", MozLocaleDir, mozLocaleDir, _, _),
                 ("dir", Dir, dir, _, _),
             ]
         }
     }