diff --git a/media/webrtc/signaling/src/media-conduit/CodecStatistics.cpp b/media/webrtc/signaling/src/media-conduit/CodecStatistics.cpp
index f13dc7efad31..876e333db244 100644
--- a/media/webrtc/signaling/src/media-conduit/CodecStatistics.cpp
+++ b/media/webrtc/signaling/src/media-conduit/CodecStatistics.cpp
@@ -16,14 +16,14 @@ using namespace webrtc;
 static const char* logTag ="WebrtcVideoSessionConduit";
 
 VideoCodecStatistics::VideoCodecStatistics(int channel,
-                                           ViECodec* codec,
-                                           bool encoder) :
+                                           ViECodec* codec) :
   mChannel(channel),
   mSentRawFrames(0),
   mPtrViECodec(codec),
   mEncoderDroppedFrames(0),
   mDecoderDiscardedPackets(0),
-  mEncoderMode(encoder),
+  mRegisteredEncode(false),
+  mRegisteredDecode(false),
   mReceiveState(kReceiveStateInitial)
 #ifdef MOZILLA_INTERNAL_API
   , mRecoveredBeforeLoss(0)
@@ -31,22 +31,29 @@ VideoCodecStatistics::VideoCodecStatistics(int channel,
 #endif
 {
   MOZ_ASSERT(mPtrViECodec);
-  if (mEncoderMode) {
-    mPtrViECodec->RegisterEncoderObserver(mChannel, *this);
-  } else {
-    mPtrViECodec->RegisterDecoderObserver(mChannel, *this);
-  }
 }
 
 VideoCodecStatistics::~VideoCodecStatistics()
 {
-  if (mEncoderMode) {
+  if (mRegisteredEncode) {
     mPtrViECodec->DeregisterEncoderObserver(mChannel);
-  } else {
+  }
+  if (mRegisteredDecode) {
     mPtrViECodec->DeregisterDecoderObserver(mChannel);
   }
 }
 
+void VideoCodecStatistics::Register(bool encoder)
+{
+  if (encoder && !mRegisteredEncode) {
+    mPtrViECodec->RegisterEncoderObserver(mChannel, *this);
+    mRegisteredEncode = true;
+  } else if (!encoder && !mRegisteredDecode) {
+    mPtrViECodec->RegisterDecoderObserver(mChannel, *this);
+    mRegisteredDecode = true;
+  }
+}
+
 void VideoCodecStatistics::OutgoingRate(const int video_channel,
                                         const uint32_t framerate,
                                         const uint32_t bitrate)
diff --git a/media/webrtc/signaling/src/media-conduit/CodecStatistics.h b/media/webrtc/signaling/src/media-conduit/CodecStatistics.h
index 6f61c31709de..ab81a6f33424 100644
--- a/media/webrtc/signaling/src/media-conduit/CodecStatistics.h
+++ b/media/webrtc/signaling/src/media-conduit/CodecStatistics.h
@@ -21,8 +21,9 @@ class VideoCodecStatistics : public webrtc::ViEEncoderObserver
                            , public webrtc::ViEDecoderObserver
 {
 public:
-  VideoCodecStatistics(int channel, webrtc::ViECodec* vieCodec, bool encoder);
+  VideoCodecStatistics(int channel, webrtc::ViECodec* vieCodec);
   ~VideoCodecStatistics();
+  void Register(bool encoder);
 
   void SentFrame();
   virtual void OutgoingRate(const int video_channel,
@@ -92,7 +93,8 @@ private:
   RunningStat mDecoderBitRate;
   RunningStat mDecoderFps;
   uint32_t mDecoderDiscardedPackets;
-  const bool mEncoderMode;
+  bool mRegisteredEncode;
+  bool mRegisteredDecode;
 
   webrtc::VideoReceiveState mReceiveState;
 #ifdef MOZILLA_INTERNAL_API
diff --git a/media/webrtc/signaling/src/media-conduit/VideoConduit.cpp b/media/webrtc/signaling/src/media-conduit/VideoConduit.cpp
index 5dca63382a15..c534f14c850e 100755
--- a/media/webrtc/signaling/src/media-conduit/VideoConduit.cpp
+++ b/media/webrtc/signaling/src/media-conduit/VideoConduit.cpp
@@ -644,8 +644,9 @@ WebrtcVideoConduit::ConfigureSendMediaCodec(const VideoCodecConfig* codecConfig)
   }
 
   if (!mVideoCodecStat) {
-    mVideoCodecStat = new VideoCodecStatistics(mChannel, mPtrViECodec, true);
+    mVideoCodecStat = new VideoCodecStatistics(mChannel, mPtrViECodec);
   }
+  mVideoCodecStat->Register(true);
 
   mSendingWidth = 0;
   mSendingHeight = 0;
@@ -800,8 +801,9 @@ WebrtcVideoConduit::ConfigureRecvMediaCodecs(
   }
 
   if (!mVideoCodecStat) {
-    mVideoCodecStat = new VideoCodecStatistics(mChannel, mPtrViECodec, false);
+    mVideoCodecStat = new VideoCodecStatistics(mChannel, mPtrViECodec);
   }
+  mVideoCodecStat->Register(false);
 
   // XXX Currently, we gather up all of the feedback types that the remote
   // party indicated it supports for all video codecs and configure the entire