diff -u b/core/modules/overlay/lib/Drupal/overlay/Tests/OverlayCloseTest.php b/core/modules/overlay/lib/Drupal/overlay/Tests/OverlayCloseTest.php
--- b/core/modules/overlay/lib/Drupal/overlay/Tests/OverlayCloseTest.php
+++ b/core/modules/overlay/lib/Drupal/overlay/Tests/OverlayCloseTest.php
@@ -2,7 +2,7 @@
 
 /**
  * @file
- * Contains Drupal\overlay\Tests\OverlayCloseTest.
+ * Contains \Drupal\overlay\Tests\OverlayCloseTest.
  */
 
 namespace Drupal\overlay\Tests;