diff --git a/src/extension.js b/src/extension.js
index 6c4aed2..2c50594 100644
--- a/src/extension.js
+++ b/src/extension.js
@@ -172,7 +172,7 @@ WeatherMenuButton.prototype = {
 
         this.menu.addMenuItem(new PopupMenu.PopupSeparatorMenuItem());
 
-        item = new PopupMenu.PopupMenuItem("Preferences...");
+        let item = new PopupMenu.PopupMenuItem("Preferences...");
         item.connect('activate', Open_Perference);
         this.menu.addMenuItem(item);