diff --git xspf_playlist.module xspf_playlist.module
index ef3bf53..f250f54 100644
--- xspf_playlist.module
+++ xspf_playlist.module
@@ -307,7 +307,7 @@ function xspf_playlist_item_mime($filepath) {
 function xspf_playlist_url($path, $custom_base_url = NULL) {
   // don't modify http paths
   if (strstr($path, 'http')) {
-    return;
+    return $path;
   }
   // Fetch a custom base URL, if present.
   if ( $custom_base_url = variable_get('xspf_playlist_base_url', FALSE) ) {