diff --git a/core/lib/Drupal/Component/PhpStorage/MTimeProtectedFastFileStorage.php b/core/lib/Drupal/Component/PhpStorage/MTimeProtectedFastFileStorage.php
index 4e2aec583815dbf5a077f8a2d4e511f7fe50d6a9..68a62052d15e1084222005dc5df365c70d2dc8c6 100644
--- a/core/lib/Drupal/Component/PhpStorage/MTimeProtectedFastFileStorage.php
+++ b/core/lib/Drupal/Component/PhpStorage/MTimeProtectedFastFileStorage.php
@@ -101,7 +101,7 @@ public function save($name, $data) {
     $i = 0;
     while (($mtime = $this->getUncachedMTime($directory)) && ($mtime != $previous_mtime)) {
       $previous_mtime = $mtime;
-      chmod($directory, 0300);
+      chmod($directory, 0700);
       // Reset the file back in the temporary location if this is not the first
       // iteration.
       if ($i > 0) {