diff --git a/draftfile.php b/draftfile.php
index baeceaf7af7..ede57069134 100644
--- a/draftfile.php
+++ b/draftfile.php
@@ -36,6 +36,7 @@ if (isguestuser()) {
 }
 
 $relativepath = get_file_argument();
+$preview = optional_param('preview', null, PARAM_ALPHANUM);
 
 // relative path must start with '/'
 if (!$relativepath) {
@@ -84,4 +85,4 @@ if (!$file = $fs->get_file_by_hash(sha1($fullpath)) or $file->get_filename() ==
 // finally send the file
 // ========================================
 session_get_instance()->write_close(); // unlock session during fileserving
-send_stored_file($file, 0, false, true); // force download - security first!
+send_stored_file($file, 0, false, true, array('preview' => $preview)); // force download - security first!