diff --git a/services/audioflinger/PlaybackTracks.h b/services/audioflinger/PlaybackTracks.h
index 3edeee3..84758a4 100644
--- a/services/audioflinger/PlaybackTracks.h
+++ b/services/audioflinger/PlaybackTracks.h
@@ -225,9 +225,7 @@
     void setInternalMute(bool muted) final { mInternalMute = muted; }
 
     // VolumePortInterface implementation
-    void setPortVolume(float volume) override {
-        mVolume = volume;
-    }
+    void setPortVolume(float volume) override;
     float getPortVolume() const override { return mVolume; }
 
 protected:
@@ -414,7 +412,7 @@
     std::unique_ptr<os::PersistableBundle> mMuteEventExtras;
     mute_state_t        mMuteState;
     bool                mInternalMute = false;
-    float mVolume = 0.0f;
+    std::atomic<float> mVolume = 0.0f;
 };  // end of Track