diff --git a/modules/core/preferences.js b/modules/core/preferences.js
index 18c2077a1..b2a9774d9 100644
--- a/modules/core/preferences.js
+++ b/modules/core/preferences.js
@@ -46,6 +46,6 @@ function corePreferences(k, v) {
 corePreferences.onChange = function(k, handler) {
   _listeners[k] = _listeners[k] || [];
   _listeners[k].push(handler);
-}
+};
 
 export { corePreferences as prefs };