diff --git a/menu-labelled-open/background.js b/menu-labelled-open/background.js
index 9eae348..d49db64 100644
--- a/menu-labelled-open/background.js
+++ b/menu-labelled-open/background.js
@@ -1,6 +1,8 @@
+'use strict';
+
 const openLabelledId = "open-labelled";
 
-let menuItem = browser.menus.create({
+browser.menus.create({
   id: openLabelledId,
   title: "Open",
   contexts: ["link"]