diff --git a/core/example-tests/example.js b/core/example-tests/example.js
index f843e609e3..c96fcca383 100644
--- a/core/example-tests/example.js
+++ b/core/example-tests/example.js
@@ -1,6 +1,13 @@
 const exec = require('child_process').exec;
 
 var simpletestCookie;
+
+if (typeof process.env.SIMPLETEST_BASE_URL === 'undefined') {
+  console.error('Missing SIMPLETEST_BASE_URL environment variable.');
+  exit(1);
+}
+const BASEURL = process.env.SIMPLETEST_BASE_URL;
+
 /**
  * @param browser
  * @param cookieValue
@@ -8,11 +15,14 @@ var simpletestCookie;
  */
 const setupCookie = function (browser, cookieValue) {
   return browser
+    // See https://bugs.chromium.org/p/chromedriver/issues/detail?id=728#c10
+    .url(BASEURL)
     .setCookie({
       name: 'SIMPLETEST_USER_AGENT',
-      value: cookieValue,
-      path: '/d8/',
-      domain: 'localhost',
+      // Colons needs to be URL encoded to be valid.
+      value: encodeURIComponent(cookieValue),
+      path: BASEURL.split(extractHostname)[1],
+      domain: extractHostname(BASEURL),
     });
 };
 
@@ -32,8 +42,8 @@ module.exports = {
 
   'Demo test Frontpage' : function (browser) {
 	  setupCookie(browser, simpletestCookie)
-      .url('http://localhost/d8/')
-      .assert.containsText('#main', 'Home')
+      .url(BASEURL)
+      .assert.containsText('main', 'Log in')
       .end();
   }
 };