diff --git a/core/modules/system/src/Tests/Theme/TwigEnvironmentTest.php b/core/modules/system/src/Tests/Theme/TwigEnvironmentTest.php
index ffbe6db..d666852 100644
--- a/core/modules/system/src/Tests/Theme/TwigEnvironmentTest.php
+++ b/core/modules/system/src/Tests/Theme/TwigEnvironmentTest.php
@@ -8,6 +8,7 @@
 namespace Drupal\system\Tests\Theme;
 
 use Drupal\Component\Utility\String;
+use Drupal\Core\Site\Settings;
 use Drupal\simpletest\KernelTestBase;
 
 /**