diff --git a/includes/MediaYouTubeStreamWrapper.inc b/includes/MediaYouTubeStreamWrapper.inc
index 4501cb2da0c3f1fa7beb72a9ccb0d99bcbe5aee7..cbdc1f2ff46aa4755717163b0f3499228c0b5aef 100644
--- a/includes/MediaYouTubeStreamWrapper.inc
+++ b/includes/MediaYouTubeStreamWrapper.inc
@@ -43,7 +43,7 @@ class MediaYouTubeStreamWrapper extends MediaReadOnlyStreamWrapper {
 
   function getLocalThumbnailPath() {
     $parts = $this->get_parameters();
-    $local_path = 'public://media-youtube/' . check_plain($parts['v']) . '.jpg';
+    $local_path = file_default_scheme() . '://media-youtube/' . check_plain($parts['v']) . '.jpg';
     if (!file_exists($local_path)) {
       $dirname = drupal_dirname($local_path);
       file_prepare_directory($dirname, FILE_CREATE_DIRECTORY | FILE_MODIFY_PERMISSIONS);