diff --git a/src/app/ui/styles-guide/theme-chooser.js b/src/app/ui/styles-guide/theme-chooser.js
index 671f0e5f8a..2dc60d3b74 100644
--- a/src/app/ui/styles-guide/theme-chooser.js
+++ b/src/app/ui/styles-guide/theme-chooser.js
@@ -19,7 +19,7 @@ const themeVariable = {
 module.exports = {
 
   chooser: function () {
-    var themeStorage = new Storage('style:')
+    const themeStorage = new Storage('style:')
     if (themeStorage.exists('theme')) {
       if (themeStorage.get('theme') === 'dark') {
         document.getElementById('theme-link').setAttribute('href', themes['dark'])