diff --git a/src/MediaSource/MediaSourceService.php b/src/MediaSource/MediaSourceService.php
index 2044ab00..af23c26a 100644
--- a/src/MediaSource/MediaSourceService.php
+++ b/src/MediaSource/MediaSourceService.php
@@ -206,6 +206,8 @@ class MediaSourceService {
 
     $content_length = stream_copy_to_stream($resource, $destination);
 
+    fclose($destination);
+
     if ($content_length === FALSE) {
       throw new HttpException(500, "Request body could not be copied to $uri");
     }