--- a/dom/filesystem/compat/FileSystemDirectoryReader.h
+++ b/dom/filesystem/compat/FileSystemDirectoryReader.h
@@ -5,16 +5,17 @@
  * You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #ifndef mozilla_dom_FileSystemDirectoryReader_h
 #define mozilla_dom_FileSystemDirectoryReader_h
 
 #include "mozilla/Attributes.h"
 #include "mozilla/ErrorResult.h"
 #include "mozilla/dom/BindingDeclarations.h"
+#include "mozilla/dom/FileSystemDirectoryEntry.h"
 #include "nsCycleCollectionParticipant.h"
 #include "nsWrapperCache.h"
 
 namespace mozilla {
 namespace dom {
 
 class Directory;
 class FileSystem;