diff --git a/dom/media/AudioStream.cpp b/dom/media/AudioStream.cpp
index 4acb14500b8b..ed7846a285f8 100644
--- a/dom/media/AudioStream.cpp
+++ b/dom/media/AudioStream.cpp
@@ -121,8 +121,6 @@ private:
 
 AudioStream::AudioStream(DataSource& aSource)
   : mMonitor("AudioStream")
-  , mInRate(0)
-  , mOutRate(0)
   , mChannels(0)
   , mOutChannels(0)
   , mTimeStretcher(nullptr)
@@ -328,7 +326,6 @@ AudioStream::Init(uint32_t aNumChannels, uint32_t aRate,
   auto isFirst = CubebUtils::GetFirstStream();
 
   LOG("%s channels: %d, rate: %d", __FUNCTION__, aNumChannels, aRate);
-  mInRate = mOutRate = aRate;
   mChannels = aNumChannels;
   mOutChannels = aNumChannels;
 
diff --git a/dom/media/AudioStream.h b/dom/media/AudioStream.h
index e0a48f63f967..ebc40c552913 100644
--- a/dom/media/AudioStream.h
+++ b/dom/media/AudioStream.h
@@ -279,10 +279,6 @@ private:
   // The monitor is held to protect all access to member variables.
   Monitor mMonitor;
 
-  // Input rate in Hz (characteristic of the media being played)
-  uint32_t mInRate;
-  // Output rate in Hz (characteristic of the playback rate)
-  uint32_t mOutRate;
   uint32_t mChannels;
   uint32_t mOutChannels;
   AudioClock mAudioClock;