--- a/dom/media/MediaRecorder.cpp
+++ b/dom/media/MediaRecorder.cpp
@@ -13,16 +13,17 @@
 #include "mozilla/StaticPtr.h"
 #include "mozilla/DOMEventTargetHelper.h"
 #include "mozilla/Preferences.h"
 #include "mozilla/dom/AudioStreamTrack.h"
 #include "mozilla/dom/BlobEvent.h"
 #include "mozilla/dom/File.h"
 #include "mozilla/dom/RecordErrorEvent.h"
 #include "mozilla/dom/VideoStreamTrack.h"
+#include "nsContentUtils.h"
 #include "nsError.h"
 #include "nsIDocument.h"
 #include "nsIPermissionManager.h"
 #include "nsIPrincipal.h"
 #include "nsMimeTypes.h"
 #include "nsProxyRelease.h"
 #include "nsTArray.h"
 #include "GeckoProfiler.h"