diff --git a/core/tests/Drupal/Tests/Core/Extension/ThemeHandlerTest.php b/core/tests/Drupal/Tests/Core/Extension/ThemeHandlerTest.php
index 708ab21..a081ba8 100644
--- a/core/tests/Drupal/Tests/Core/Extension/ThemeHandlerTest.php
+++ b/core/tests/Drupal/Tests/Core/Extension/ThemeHandlerTest.php
@@ -270,6 +270,7 @@ public function testRebuildThemeData() {
       'screen' => array(
         'seven.base.css' => DRUPAL_ROOT . '/core/themes/seven/seven.base.css',
         'style.css' => DRUPAL_ROOT . '/core/themes/seven/style.css',
+        'css/layout.css' => DRUPAL_ROOT . '/core/themes/seven/css/layout.css',
         'css/components/buttons.css' => DRUPAL_ROOT . '/core/themes/seven/css/components/buttons.css',
         'css/components/buttons.theme.css' => DRUPAL_ROOT . '/core/themes/seven/css/components/buttons.theme.css',
       ),