diff --git a/core/modules/system/tests/modules/common_test/common_test.routing.yml b/core/modules/system/tests/modules/common_test/common_test.routing.yml
index a542802..da045d0 100644
--- a/core/modules/system/tests/modules/common_test/common_test.routing.yml
+++ b/core/modules/system/tests/modules/common_test/common_test.routing.yml
@@ -5,7 +5,7 @@ common_test_l_active_class:
   requirements:
     _access: 'TRUE'
 common_test_destination:
-  pattern: 'common-test/destination'
+  pattern: '/common-test/destination'
   defaults:
     _controller: '\Drupal\common_test\Controller\CommonTestTextController::destination'
   requirements:
diff --git a/core/modules/system/tests/modules/common_test/lib/Drupal/common_test/Controller/CommonTestTextController.php b/core/modules/system/tests/modules/common_test/lib/Drupal/common_test/Controller/CommonTestTextController.php
index a28b836..eb5500e 100644
--- a/core/modules/system/tests/modules/common_test/lib/Drupal/common_test/Controller/CommonTestTextController.php
+++ b/core/modules/system/tests/modules/common_test/lib/Drupal/common_test/Controller/CommonTestTextController.php
@@ -17,7 +17,7 @@ class CommonTestTextController {
   /**
    * Prints a destination query parameter.
    *
-   * @return Response
+   * @return Symfony\Component\HttpFoundation\Response
    *   A new Response object containing a string with the destination query
    *   parameter.
    */