diff --git a/core/modules/system/lib/Drupal/system/Tests/Path/UrlAlterFunctionalTest.php b/core/modules/system/lib/Drupal/system/Tests/Path/UrlAlterFunctionalTest.php
index f464f69..723177b 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Path/UrlAlterFunctionalTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Path/UrlAlterFunctionalTest.php
@@ -112,7 +112,7 @@ protected function assertUrlOutboundAlter($original, $final) {
    *
    * @param $original
    *   A string with the aliased or un-normal path that is run through
-   *   Drupal::service('path.alias_manager')->getSystemPath().
+   *   \Drupal::service('path.alias_manager')->getSystemPath().
    * @param $final
    *   A string with the expected result after url().
    * @return