diff --git a/services/audioflinger/MmapTracks.h b/services/audioflinger/MmapTracks.h
index 8758bd0..85ce142 100644
--- a/services/audioflinger/MmapTracks.h
+++ b/services/audioflinger/MmapTracks.h
@@ -35,8 +35,7 @@
                             bool isOut,
                             const android::content::AttributionSourceState& attributionSource,
                             pid_t creatorPid,
-                            audio_port_handle_t portId = AUDIO_PORT_HANDLE_NONE,
-                            float volume = 0.0f);
+                            audio_port_handle_t portId = AUDIO_PORT_HANDLE_NONE);
     ~MmapTrack() override;
 
     status_t initCheck() const final;
@@ -66,13 +65,6 @@
     void processMuteEvent_l(const sp<IAudioManager>& audioManager,
                             mute_state_t muteState)
                             /* REQUIRES(MmapPlaybackThread::mLock) */ final;
-
-    // VolumePortInterface implementation
-    void setPortVolume(float volume) override {
-        mVolume = volume;
-    }
-    float getPortVolume() const override { return mVolume; }
-
 private:
     DISALLOW_COPY_AND_ASSIGN(MmapTrack);
 
@@ -95,8 +87,6 @@
             /* GUARDED_BY(MmapPlaybackThread::mLock) */;
     mute_state_t mMuteState
             /* GUARDED_BY(MmapPlaybackThread::mLock) */;
-
-    float mVolume = 0.0f;
 };  // end of Track
 
 } // namespace android
\ No newline at end of file