diff --git a/core/lib/Drupal/Component/PhpStorage/FileStorage.php b/core/lib/Drupal/Component/PhpStorage/FileStorage.php
index b4d35b9..7eb64b6 100644
--- a/core/lib/Drupal/Component/PhpStorage/FileStorage.php
+++ b/core/lib/Drupal/Component/PhpStorage/FileStorage.php
@@ -53,14 +53,15 @@ public function load($name) {
    */
   public function save($name, $code) {
     $path = $this->getFullPath($name);
+    $flags = parse_url($path, PHP_URL_SCHEME) == 'file' ? LOCK_EX : 0;
     $directory = dirname($path);
     if ($this->ensureDirectory($directory)) {
       $htaccess_path =  $directory . '/.htaccess';
-      if (!file_exists($htaccess_path) && file_put_contents($htaccess_path, static::htaccessLines(), LOCK_EX)) {
+      if (!file_exists($htaccess_path) && file_put_contents($htaccess_path, static::htaccessLines(), $flags)) {
         @chmod($htaccess_path, 0444);
       }
     }
-    return (bool) file_put_contents($path, $code, LOCK_EX);
+    return (bool) file_put_contents($path, $code, $flags);
   }
 
   /**
@@ -131,9 +132,10 @@ public static function htaccessLines($private = TRUE) {
    *   TRUE if the directory exists or has been created, FALSE otherwise.
    */
   protected function ensureDirectory($directory, $mode = 0777) {
+    $flags = parse_url($directory, PHP_URL_SCHEME) == 'file' ? LOCK_EX : 0;
     if ($this->createDirectory($directory, $mode)) {
       $htaccess_path =  $directory . '/.htaccess';
-      if (!file_exists($htaccess_path) && file_put_contents($htaccess_path, static::htaccessLines(), LOCK_EX)) {
+      if (!file_exists($htaccess_path) && file_put_contents($htaccess_path, static::htaccessLines(), $flags)) {
         @chmod($htaccess_path, 0444);
       }
     }