--- a/dom/media/mediasink/AudioSink.cpp
+++ b/dom/media/mediasink/AudioSink.cpp
@@ -398,19 +398,19 @@ AudioSink::NotifyAudioNeeded()
       const AudioConfig::ChannelLayout inputLayout =
         data->mChannelMap
           ? AudioConfig::ChannelLayout::SMPTEDefault(data->mChannelMap)
           : AudioConfig::ChannelLayout(data->mChannels);
       const AudioConfig::ChannelLayout outputLayout =
         mOutputChannels == data->mChannels
           ? inputLayout
           : AudioConfig::ChannelLayout(mOutputChannels);
-      mConverter =
-        MakeUnique<AudioConverter>(AudioConfig(inputLayout, data->mRate),
-                                   AudioConfig(outputLayout, mOutputRate));
+      mConverter = MakeUnique<AudioConverter>(
+        AudioConfig(inputLayout, data->mChannels, data->mRate),
+        AudioConfig(outputLayout, mOutputChannels, mOutputRate));
     }
 
     // See if there's a gap in the audio. If there is, push silence into the
     // audio hardware, so we can play across the gap.
     // Calculate the timestamp of the next chunk of audio in numbers of
     // samples.
     CheckedInt64 sampleTime =
       TimeUnitToFrames(data->mTime - mStartTime, data->mRate);