diff --git a/src/metadata.js b/src/metadata.js
index 08164054b..029ad77f5 100644
--- a/src/metadata.js
+++ b/src/metadata.js
@@ -1,5 +1,6 @@
 /* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
+/* globals Document, error, PDFJS */
 /* Copyright 2012 Mozilla Foundation
  *
  * Licensed under the Apache License, Version 2.0 (the "License");