diff --git a/dom/media/AccurateSeekTask.cpp b/dom/media/AccurateSeekTask.cpp
index 739fa3a76082..c3206b63bf5c 100644
--- a/dom/media/AccurateSeekTask.cpp
+++ b/dom/media/AccurateSeekTask.cpp
@@ -62,13 +62,6 @@ AccurateSeekTask::Discard()
   mIsDiscarded = true;
 }
 
-bool
-AccurateSeekTask::NeedToResetMDSM() const
-{
-  AssertOwnerThread();
-  return true;
-}
-
 int64_t
 AccurateSeekTask::CalculateNewCurrentTime() const
 {
diff --git a/dom/media/AccurateSeekTask.h b/dom/media/AccurateSeekTask.h
index 96e10b42f7ba..f2daf84c7d51 100644
--- a/dom/media/AccurateSeekTask.h
+++ b/dom/media/AccurateSeekTask.h
@@ -27,8 +27,6 @@ public:
 
   RefPtr<SeekTaskPromise> Seek(const media::TimeUnit& aDuration) override;
 
-  bool NeedToResetMDSM() const override;
-
   int64_t CalculateNewCurrentTime() const override;
 
   void HandleAudioDecoded(MediaData* aAudio) override;
diff --git a/dom/media/MediaDecoderStateMachine.cpp b/dom/media/MediaDecoderStateMachine.cpp
index c21979339b59..b659751e0285 100644
--- a/dom/media/MediaDecoderStateMachine.cpp
+++ b/dom/media/MediaDecoderStateMachine.cpp
@@ -789,14 +789,7 @@ public:
       mMaster->UpdateNextFrameStatus(MediaDecoderOwner::NEXT_FRAME_UNAVAILABLE_SEEKING);
     }
 
-    // Reset our state machine and decoding pipeline before seeking.
-    if (mSeekTask->NeedToResetMDSM()) {
-      if (mSeekJob.mTarget.IsVideoOnly()) {
-        mMaster->Reset(TrackInfo::kVideoTrack);
-      } else {
-        mMaster->Reset();
-      }
-    }
+    ResetMDSM();
 
     // Do the seek.
     mSeekTaskRequest.Begin(mSeekTask->Seek(mMaster->Duration())
@@ -915,6 +908,8 @@ private:
 
   virtual void CreateSeekTask() = 0;
 
+  virtual void ResetMDSM() = 0;
+
   MozPromiseRequestHolder<SeekTask::SeekTaskPromise> mSeekTaskRequest;
 };
 
@@ -940,6 +935,15 @@ private:
       mMaster->mDecoderID, OwnerThread(), Reader(), mSeekJob.mTarget,
       Info(), mMaster->Duration(), mMaster->GetMediaTime());
   }
+
+  void ResetMDSM() override
+  {
+    if (mSeekJob.mTarget.IsVideoOnly()) {
+      mMaster->Reset(TrackInfo::kVideoTrack);
+    } else {
+      mMaster->Reset();
+    }
+  }
 };
 
 class MediaDecoderStateMachine::NextFrameSeekingState
@@ -965,6 +969,11 @@ private:
       Info(), mMaster->Duration(),mMaster->GetMediaTime(),
       AudioQueue(), VideoQueue());
   }
+
+  void ResetMDSM() override
+  {
+    // Do nothing.
+  }
 };
 
 
diff --git a/dom/media/NextFrameSeekTask.cpp b/dom/media/NextFrameSeekTask.cpp
index ad2a52c4bbca..5ecc1b058016 100644
--- a/dom/media/NextFrameSeekTask.cpp
+++ b/dom/media/NextFrameSeekTask.cpp
@@ -55,13 +55,6 @@ NextFrameSeekTask::Discard()
   mIsDiscarded = true;
 }
 
-bool
-NextFrameSeekTask::NeedToResetMDSM() const
-{
-  AssertOwnerThread();
-  return false;
-}
-
 int64_t
 NextFrameSeekTask::CalculateNewCurrentTime() const
 {
diff --git a/dom/media/NextFrameSeekTask.h b/dom/media/NextFrameSeekTask.h
index f2ce70e3b427..534d70cbce56 100644
--- a/dom/media/NextFrameSeekTask.h
+++ b/dom/media/NextFrameSeekTask.h
@@ -38,8 +38,6 @@ public:
 
   RefPtr<SeekTaskPromise> Seek(const media::TimeUnit& aDuration) override;
 
-  bool NeedToResetMDSM() const override;
-
   int64_t CalculateNewCurrentTime() const override;
 
   void HandleAudioDecoded(MediaData* aAudio) override;
diff --git a/dom/media/SeekTask.h b/dom/media/SeekTask.h
index 04a84d06e479..bc11f8942dfd 100644
--- a/dom/media/SeekTask.h
+++ b/dom/media/SeekTask.h
@@ -58,8 +58,6 @@ public:
 
   virtual RefPtr<SeekTaskPromise> Seek(const media::TimeUnit& aDuration) = 0;
 
-  virtual bool NeedToResetMDSM() const = 0;
-
   virtual int64_t CalculateNewCurrentTime() const = 0;
 
   virtual void HandleAudioDecoded(MediaData* aAudio) = 0;