diff --git a/core/modules/system/lib/Drupal/system/Tests/Theme/ThemeTest.php b/core/modules/system/lib/Drupal/system/Tests/Theme/ThemeTest.php
index d449556..502c955 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Theme/ThemeTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Theme/ThemeTest.php
@@ -8,7 +8,7 @@
 namespace Drupal\system\Tests\Theme;
 
 use Drupal\simpletest\WebTestBase;
-use Drupal\theme_test\ThemeClass;
+use Drupal\test_theme\ThemeClass;
 
 /**
  * Tests low-level theme functions.