diff --git a/core/modules/simpletest/src/JavascriptTestBase.php b/core/modules/simpletest/src/JavascriptTestBase.php
index a9c66a6..f7cdc11 100644
--- a/core/modules/simpletest/src/JavascriptTestBase.php
+++ b/core/modules/simpletest/src/JavascriptTestBase.php
@@ -33,14 +33,13 @@
   /**
    * {@inheritdoc}
    */
-  protected function setUp() {
-    parent::setUp();
-
+  protected function initMink() {
     // Setup some template cache using by the phantomjs mink driver.
-    $path = '/tmp/browsertestbase-templatecache';
+    $path = sys_get_temp_dir() . DIRECTORY_SEPARATOR . 'browsertestbase-templatecache';
     if (!file_exists($path)) {
       mkdir($path);
     }
+    parent::initMink();
   }
 
 }