diff --git a/app/assets/javascripts/application.js b/app/assets/javascripts/application.js
index 9cf647db4..fc6dece59 100644
--- a/app/assets/javascripts/application.js
+++ b/app/assets/javascripts/application.js
@@ -12,10 +12,8 @@
 //= require_tree ./modules
 //= require set-ga-client-id-on-form
 
-jQuery(function ($) {
-  var $form = $('.js-service-sign-in-form')
+var form = document.querySelector('.js-service-sign-in-form')
 
-  if ($form.length) {
-    new GOVUK.SetGaClientIdOnForm({ $form: $form }) // eslint-disable-line no-new
-  }
-})
+if (form) {
+  new GOVUK.SetGaClientIdOnForm(form) // eslint-disable-line no-new
+}
diff --git a/app/assets/javascripts/set-ga-client-id-on-form.js b/app/assets/javascripts/set-ga-client-id-on-form.js
index 7998804eb..dd61d789b 100644
--- a/app/assets/javascripts/set-ga-client-id-on-form.js
+++ b/app/assets/javascripts/set-ga-client-id-on-form.js
@@ -4,15 +4,13 @@
   window.GOVUK = window.GOVUK || {}
   var GOVUK = window.GOVUK
 
-  function SetGaClientIdOnForm (options) {
-    if (!options.$form || !window.ga) { return }
-
-    var form = options.$form
+  function SetGaClientIdOnForm (form) {
+    if (!form || !window.ga) { return }
 
     window.ga(function (tracker) {
       var clientId = tracker.get('clientId')
-      var action = form.attr('action')
-      form.attr('action', action + '?_ga=' + clientId)
+      var action = form.getAttribute('action')
+      form.setAttribute('action', action + '?_ga=' + clientId)
     })
   }
 
diff --git a/spec/javascripts/set-ga-client-id-on-form.spec.js b/spec/javascripts/set-ga-client-id-on-form.spec.js
index c4a605463..b6c6c8718 100644
--- a/spec/javascripts/set-ga-client-id-on-form.spec.js
+++ b/spec/javascripts/set-ga-client-id-on-form.spec.js
@@ -2,16 +2,16 @@ var $ = window.jQuery
 
 describe('SetGaClientIdOnForm', function () {
   var GOVUK = window.GOVUK
-  var tracker = { clientId: 'clientId' }
-  tracker.get = function (arg) { return this[arg] }
-  window.ga = function (callback) { callback(tracker) }
+  var mockTracker = { clientId: 'clientId' }
+  mockTracker.get = function (arg) { return this[arg] }
+  window.ga = function (callback) { callback(mockTracker) }
   var form
 
   beforeEach(function () {
     form = $(
       '<form class="js-service-sign-in-form" action="/endpoint"></form>'
     )
-    new GOVUK.SetGaClientIdOnForm({ $form: form }) // eslint-disable-line no-new
+    new GOVUK.SetGaClientIdOnForm(form[0]) // eslint-disable-line no-new
   })
 
   it('sets the _ga client id as a query param on the form action', function () {