--- a/dom/media/MediaDecoderStateMachine.cpp
+++ b/dom/media/MediaDecoderStateMachine.cpp
@@ -21,16 +21,17 @@
 #include "mediasink/OutputStreamManager.h"
 #include "mediasink/VideoSink.h"
 #include "mozilla/DebugOnly.h"
 #include "mozilla/Logging.h"
 #include "mozilla/mozalloc.h"
 #include "mozilla/MathAlgorithms.h"
 #include "mozilla/Preferences.h"
 #include "mozilla/SharedThreadPool.h"
+#include "mozilla/Sprintf.h"
 #include "mozilla/TaskQueue.h"
 
 #include "nsComponentManagerUtils.h"
 #include "nsContentUtils.h"
 #include "nsIEventTarget.h"
 #include "nsITimer.h"
 #include "nsPrintfCString.h"
 #include "nsTArray.h"