--- a/dom/archivereader/ArchiveZipFile.h
+++ b/dom/archivereader/ArchiveZipFile.h
@@ -3,16 +3,17 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
  * You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #ifndef mozilla_dom_archivereader_domarchivefile_h__
 #define mozilla_dom_archivereader_domarchivefile_h__
 
 #include "mozilla/Attributes.h"
+#include "mozilla/ErrorResult.h"
 #include "mozilla/dom/File.h"
 
 #include "ArchiveReader.h"
 
 #include "ArchiveReaderCommon.h"
 #include "zipstruct.h"
 
 BEGIN_ARCHIVEREADER_NAMESPACE