diff --git a/core/lib/Drupal/Component/Diff/DiffEngine.php b/core/lib/Drupal/Component/Diff/DiffEngine.php
index fd6ce4b..57e34d6 100644
--- a/core/lib/Drupal/Component/Diff/DiffEngine.php
+++ b/core/lib/Drupal/Component/Diff/DiffEngine.php
@@ -8,8 +8,6 @@
  * You may copy this code freely under the conditions of the GPL.
  */
 
-namespace Drupal\Component\Diff;
-
 use Drupal\Component\Utility\Settings;
 use Drupal\Component\Utility\String;
 use Drupal\Component\Utility\Unicode;
diff --git a/core/tests/Drupal/Tests/Component/Diff/DiffEngineTest.php b/core/tests/Drupal/Tests/Component/Diff/DiffEngineTest.php
index 91185e9..8b4d41f 100644
--- a/core/tests/Drupal/Tests/Component/Diff/DiffEngineTest.php
+++ b/core/tests/Drupal/Tests/Component/Diff/DiffEngineTest.php
@@ -11,9 +11,9 @@
 // autoloading the classes in its namespace.
 require_once(__DIR__ . '/../../../../../../core/lib/Drupal/Component/Diff/DiffEngine.php');
 
-use Drupal\Component\Diff\Diff;
-use Drupal\Component\Diff\_DiffOp_Copy;
-use Drupal\Component\Diff\_DiffOp_Add;
+use Diff;
+use _DiffOp_Copy;
+use _DiffOp_Add;
 use Drupal\Tests\UnitTestCase;
 
 /**
@@ -21,7 +21,7 @@
  *
  * @group Drupal
  * @group Component
- * @group Diff
+ * @group DiffEngine
  */
 class DiffEngineTest extends UnitTestCase {