diff --git a/dom/media/webaudio/AudioListener.cpp b/dom/media/webaudio/AudioListener.cpp
index ba4073810e31..679b71b476fa 100644
--- a/dom/media/webaudio/AudioListener.cpp
+++ b/dom/media/webaudio/AudioListener.cpp
@@ -62,7 +62,7 @@ AudioListenerEngine::RightVector() const
 
 AudioListener::AudioListener(AudioContext* aContext)
   : mContext(aContext)
-  , mEngine(MakeUnique<AudioListenerEngine>())
+  , mEngine(new AudioListenerEngine())
   , mPosition()
   , mFrontVector(0., 0., -1.)
   , mRightVector(1., 0., 0.)
@@ -142,19 +142,18 @@ AudioListener::SendListenerEngineEvent(
       , mEngine(aEngine)
       , mParameter(aParameter)
       , mValue(aValue)
-    {
-    }
+    { }
     void Run() override
     {
       mEngine->RecvListenerEngineEvent(mParameter, mValue);
     }
-    AudioListenerEngine* mEngine;
+    RefPtr<AudioListenerEngine> mEngine;
     AudioListenerEngine::AudioListenerParameter mParameter;
     ThreeDPoint mValue;
   };
 
   mContext->DestinationStream()->GraphImpl()->AppendMessage(
-    MakeUnique<Message>(mEngine.get(), aParameter, aValue));
+    MakeUnique<Message>(Engine(), aParameter, aValue));
 }
 
 size_t
diff --git a/dom/media/webaudio/AudioListener.h b/dom/media/webaudio/AudioListener.h
index 34c4b376d0c9..531b9e9f6862 100644
--- a/dom/media/webaudio/AudioListener.h
+++ b/dom/media/webaudio/AudioListener.h
@@ -24,13 +24,16 @@ namespace dom {
 class AudioListenerEngine final
 {
 public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(AudioListenerEngine)
+
+  AudioListenerEngine();
+
   enum class AudioListenerParameter
   {
     POSITION,
     FRONT, // unit length
     RIGHT // unit length, orthogonal to FRONT
   };
-  AudioListenerEngine();
   void RecvListenerEngineEvent(
     AudioListenerEngine::AudioListenerParameter aParameter,
     const ThreeDPoint& aValue);
@@ -39,6 +42,8 @@ public:
   const ThreeDPoint& RightVector() const;
 
 private:
+  ~AudioListenerEngine() = default;
+
   ThreeDPoint mPosition;
   ThreeDPoint mFrontVector;
   ThreeDPoint mRightVector;
@@ -65,7 +70,7 @@ public:
   void SetOrientation(double aX, double aY, double aZ,
                       double aXUp, double aYUp, double aZUp);
 
-  const AudioListenerEngine* Engine() { return mEngine.get(); }
+  AudioListenerEngine* Engine() { return mEngine.get(); }
 
 private:
   void SendListenerEngineEvent(
@@ -77,7 +82,7 @@ private:
   void SendThreeDPointParameterToStream(uint32_t aIndex, const ThreeDPoint& aValue);
 private:
   RefPtr<AudioContext> mContext;
-  const UniquePtr<AudioListenerEngine> mEngine;
+  RefPtr<AudioListenerEngine> mEngine;
   ThreeDPoint mPosition;
   ThreeDPoint mFrontVector;
   ThreeDPoint mRightVector;
diff --git a/dom/media/webaudio/PannerNode.cpp b/dom/media/webaudio/PannerNode.cpp
index 0f09047749ef..b270cda9cdcc 100644
--- a/dom/media/webaudio/PannerNode.cpp
+++ b/dom/media/webaudio/PannerNode.cpp
@@ -44,7 +44,7 @@ class PannerNodeEngine final : public AudioNodeEngine
 public:
   explicit PannerNodeEngine(AudioNode* aNode,
                             AudioDestinationNode* aDestination,
-                            const AudioListenerEngine* aListenerEngine)
+                            AudioListenerEngine* aListenerEngine)
     : AudioNodeEngine(aNode)
     , mDestination(aDestination->Stream())
     , mListenerEngine(aListenerEngine)
@@ -256,9 +256,7 @@ public:
   // thread untile mPanningModelFunction has changed, and this happens strictly
   // later, via a MediaStreamGraph ControlMessage.
   nsAutoPtr<HRTFPanner> mHRTFPanner;
-  // This is set in the ctor, and guaranteed to live longer than this engine:
-  // its lifetime is the same as the AudioContext itself.
-  const AudioListenerEngine* mListenerEngine;
+  RefPtr<AudioListenerEngine> mListenerEngine;
   typedef void (PannerNodeEngine::*PanningModelFunction)(const AudioBlock& aInput, AudioBlock* aOutput, StreamTime tick);
   PanningModelFunction mPanningModelFunction;
   typedef float (PannerNodeEngine::*DistanceModelFunction)(double aDistance);