--- a/dom/media/mediasource/TrackBuffersManager.h
+++ b/dom/media/mediasource/TrackBuffersManager.h
@@ -158,17 +158,17 @@ public:
 
   void AddSizeOfResources(MediaSourceDecoder::ResourceSizes* aSizes);
 
 private:
   typedef MozPromise<bool, nsresult, /* IsExclusive = */ true> CodedFrameProcessingPromise;
 
   // for MediaSourceDemuxer::GetMozDebugReaderData
   friend class MediaSourceDemuxer;
-  virtual ~TrackBuffersManager();
+  ~TrackBuffersManager();
   // All following functions run on the taskqueue.
   RefPtr<AppendPromise> DoAppendData(RefPtr<MediaByteBuffer> aData,
                                      SourceBufferAttributes aAttributes);
   void ScheduleSegmentParserLoop();
   void SegmentParserLoop();
   void InitializationSegmentReceived();
   void ShutdownDemuxers();
   void CreateDemuxerforMIMEType();