--- a/dom/media/webrtc/MediaEngineWebRTCAudio.cpp
+++ b/dom/media/webrtc/MediaEngineWebRTCAudio.cpp
@@ -466,20 +466,16 @@ MediaEngineWebRTCMicrophoneSource::Updat
         mAudioInput->GetChannelCount(channelCount);
         MOZ_ASSERT(channelCount > 0);
         prefs.mChannels = channelCount;
       }
       break;
 
     case kStarted:
     case kStopped:
-      if (prefs == mLastPrefs) {
-        return NS_OK;
-      }
-
       if (prefs.mChannels != mLastPrefs.mChannels) {
         // If the channel count changed, tell the MSG to open a new driver with
         // the correct channel count.
         MOZ_ASSERT(!mAllocations.IsEmpty());
         RefPtr<SourceMediaStream> stream;
         for (const Allocation& allocation : mAllocations) {
           if (allocation.mStream && allocation.mStream->GraphImpl()) {
             stream = allocation.mStream;