--- a/dom/media/MediaDecoder.h
+++ b/dom/media/MediaDecoder.h
@@ -129,17 +129,17 @@ public:
 
   // Return the time position in the video stream being
   // played measured in seconds.
   virtual double GetCurrentTime();
 
   // Seek to the time position in (seconds) from the start of the video.
   // If aDoFastSeek is true, we'll seek to the sync point/keyframe preceeding
   // the seek target.
-  virtual void Seek(double aTime, SeekTarget::Type aSeekType);
+  void Seek(double aTime, SeekTarget::Type aSeekType);
 
   // Initialize state machine and schedule it.
   nsresult InitializeStateMachine();
 
   // Start playback of a video. 'Load' must have previously been
   // called.
   virtual nsresult Play();