--- a/content/media/webrtc/MediaEngineGonkVideoSource.h
+++ b/content/media/webrtc/MediaEngineGonkVideoSource.h
@@ -9,16 +9,17 @@
 #error MediaEngineGonkVideoSource is only available when MOZ_B2G_CAMERA is defined.
 #endif
 
 #include "CameraControlListener.h"
 #include "MediaEngineCameraVideoSource.h"
 
 #include "mozilla/Hal.h"
 #include "mozilla/ReentrantMonitor.h"
+#include "mozilla/dom/File.h"
 
 namespace mozilla {
 
 /**
  * The B2G implementation of the MediaEngine interface.
  *
  * On B2G platform, member data may accessed from different thread after construction:
  *