diff --git a/core/tests/Drupal/Tests/Core/Extension/ThemeHandlerTest.php b/core/tests/Drupal/Tests/Core/Extension/ThemeHandlerTest.php
index 869032d..45dbd0f 100644
--- a/core/tests/Drupal/Tests/Core/Extension/ThemeHandlerTest.php
+++ b/core/tests/Drupal/Tests/Core/Extension/ThemeHandlerTest.php
@@ -249,7 +249,7 @@ public function testEnableAndListInfo() {
   public function testRebuildThemeData() {
     $this->extensionDiscovery->expects($this->at(0))
       ->method('scan')
-      ->with('themes')
+      ->with('theme')
       ->will($this->returnValue(array(
         'seven' => new Extension('theme', DRUPAL_ROOT . '/core/themes/seven/seven.info.yml', 'seven.info.yml'),
       )));