diff --git a/test/list-box-test.html b/test/list-box-test.html
index 5e1a153..6710ad5 100644
--- a/test/list-box-test.html
+++ b/test/list-box-test.html
@@ -5,6 +5,7 @@
   <title>vaadin-list-box tests</title>
   <script src="../../web-component-tester/browser.js"></script>
   <script src="../../webcomponentsjs/webcomponents-lite.js"></script>
+  <link rel="import" href="../../test-fixture/test-fixture.html">
   <link rel="import" href="../../vaadin-item/vaadin-item.html">
   <link rel="import" href="../vaadin-list-box.html">
 </head>
diff --git a/wct.conf.js b/wct.conf.js
index 44fa12a..6af45ca 100644
--- a/wct.conf.js
+++ b/wct.conf.js
@@ -18,7 +18,9 @@ module.exports = {
       'macOS 10.12/iphone@11.2',
       'macOS 10.12/ipad@11.2',
       'Windows 10/chrome@65',
-      'macOS 10.12/safari@11.0'
+      'macOS 10.12/safari@11.0',
+      'Windows 10/firefox@59',
+      'Windows 10/microsoftedge@16'
     ];
 
     var cronPlatforms = [