diff --git a/packages/test-utils/src/mount.js b/packages/test-utils/src/mount.js
index 01c2ec7da..b59ef7192 100644
--- a/packages/test-utils/src/mount.js
+++ b/packages/test-utils/src/mount.js
@@ -1,7 +1,5 @@
 // @flow
 
-import './matches-polyfill'
-import './object-assign-polyfill'
 import Vue from 'vue'
 import VueWrapper from './vue-wrapper'
 import createInstance from 'create-instance'
diff --git a/packages/test-utils/src/object-assign-polyfill.js b/packages/test-utils/src/object-assign-polyfill.js
deleted file mode 100644
index 16851a00d..000000000
--- a/packages/test-utils/src/object-assign-polyfill.js
+++ /dev/null
@@ -1,23 +0,0 @@
-if (typeof Object.assign !== 'function') {
-  (function () {
-    Object.assign = function (target) {
-      'use strict'
-      if (target === undefined || target === null) {
-        throw new TypeError('Cannot convert undefined or null to object')
-      }
-
-      var output = Object(target)
-      for (var index = 1; index < arguments.length; index++) {
-        var source = arguments[index]
-        if (source !== undefined && source !== null) {
-          for (var nextKey in source) {
-            if (source.hasOwnProperty(nextKey)) {
-              output[nextKey] = source[nextKey]
-            }
-          }
-        }
-      }
-      return output
-    }
-  })()
-}
diff --git a/test/setup/karma.conf.js b/test/setup/karma.conf.js
index b99b4651e..fe87ad6eb 100644
--- a/test/setup/karma.conf.js
+++ b/test/setup/karma.conf.js
@@ -7,6 +7,7 @@ module.exports = function (config) {
     reporters: ['spec'],
     files: [
       '../../node_modules/babel-polyfill/dist/polyfill.js',
+      './polyfills.js',
       'load-tests.js'
     ],
     preprocessors: {
diff --git a/packages/test-utils/src/matches-polyfill.js b/test/setup/polyfills.js
similarity index 79%
rename from packages/test-utils/src/matches-polyfill.js
rename to test/setup/polyfills.js
index cecb679a6..68b39779e 100644
--- a/packages/test-utils/src/matches-polyfill.js
+++ b/test/setup/polyfills.js
@@ -6,8 +6,8 @@ if (typeof Element !== 'undefined' && !Element.prototype.matches) {
     Element.prototype.oMatchesSelector ||
     Element.prototype.webkitMatchesSelector ||
     function (s) {
-      const matches = (this.document || this.ownerDocument).querySelectorAll(s)
-      let i = matches.length
+      var matches = (this.document || this.ownerDocument).querySelectorAll(s)
+      var i = matches.length
       while (--i >= 0 && matches.item(i) !== this) {}
       return i > -1
     }