diff --git a/service-worker.js b/service-worker.js
index 77270520..601073ea 100644
--- a/service-worker.js
+++ b/service-worker.js
@@ -28,7 +28,7 @@
  * The value is defined in app.js and will be passed to Service Worker on initialization (to avoid duplication)
  * @type {String}
  */
-var CACHE_NAME;
+const CACHE_NAME;
 
 /**
  * A global Boolean that governs whether CACHE_NAME will be used
@@ -259,4 +259,4 @@ function testCacheAndCountAssets(url) {
     }).catch(function(err) {
         return err;
     });
-}
\ No newline at end of file
+}