diff --git a/src/templates/timeslider.html b/src/templates/timeslider.html
index f04bf0c23..c577f3013 100644
--- a/src/templates/timeslider.html
+++ b/src/templates/timeslider.html
@@ -265,12 +265,12 @@
     // server sends the CLIENT_VARS message.
     randomVersionString: <%-JSON.stringify(settings.randomVersionString)%>,
   };
-  var BroadcastSlider;
+  let BroadcastSlider;
   (function () {
-    var pathComponents = location.pathname.split('/');
+    const pathComponents = location.pathname.split('/');
 
     // Strip 'p', the padname and 'timeslider' from the pathname and set as baseURL
-    var baseURL = pathComponents.slice(0,pathComponents.length-3).join('/') + '/';
+    const baseURL = pathComponents.slice(0,pathComponents.length-3).join('/') + '/';
 
 
     require.setRootURI(baseURL + "javascripts/src");
@@ -280,20 +280,20 @@
     $ = jQuery = require('ep_etherpad-lite/static/js/rjquery').jQuery; // Expose jQuery #HACK
     browser = require('ep_etherpad-lite/static/js/vendors/browser');
 
-    var plugins = require('ep_etherpad-lite/static/js/pluginfw/client_plugins');
-    var socket = require('ep_etherpad-lite/static/js/timeslider').socket;
+    const plugins = require('ep_etherpad-lite/static/js/pluginfw/client_plugins');
+    const socket = require('ep_etherpad-lite/static/js/timeslider').socket;
     BroadcastSlider = require('ep_etherpad-lite/static/js/timeslider').BroadcastSlider;
     plugins.baseURL = baseURL;
 
     plugins.update(function () {
-      var hooks = require('ep_etherpad-lite/static/js/pluginfw/hooks');
-      var timeslider = require('ep_etherpad-lite/static/js/timeslider')
+      const hooks = require('ep_etherpad-lite/static/js/pluginfw/hooks');
+      const timeslider = require('ep_etherpad-lite/static/js/timeslider')
       timeslider.baseURL = baseURL;
       timeslider.init();
 
       /* TODO: These globals shouldn't exist. */
-      padeditbar = require('ep_etherpad-lite/static/js/pad_editbar').padeditbar;
-      padimpexp = require('ep_etherpad-lite/static/js/pad_impexp').padimpexp;
+      const padeditbar = require('ep_etherpad-lite/static/js/pad_editbar').padeditbar;
+      const padimpexp = require('ep_etherpad-lite/static/js/pad_impexp').padimpexp;
 
       padeditbar.init()
     });