diff --git a/core/lib/Drupal/Component/PhpStorage/MTimeProtectedFileStorage.php b/core/lib/Drupal/Component/PhpStorage/MTimeProtectedFileStorage.php
index 26d8200c83e..077a40dd389 100644
--- a/core/lib/Drupal/Component/PhpStorage/MTimeProtectedFileStorage.php
+++ b/core/lib/Drupal/Component/PhpStorage/MTimeProtectedFileStorage.php
@@ -58,7 +58,8 @@ class MTimeProtectedFileStorage extends MTimeProtectedFastFileStorage {
    *
    * @param string $name
    *   The virtual file name. Can be a relative path.
-   * return string
+   *
+   * @return string|false
    *   The full path where the file is if it is valid, FALSE otherwise.
    */
   protected function checkFile($name) {