diff --git a/services/audioflinger/Threads.h b/services/audioflinger/Threads.h
index 7f3ea0f..e8b2158 100644
--- a/services/audioflinger/Threads.h
+++ b/services/audioflinger/Threads.h
@@ -907,6 +907,11 @@
     int64_t                         mBytesWritten;
     int64_t                         mFramesWritten; // not reset on standby
     int64_t                         mSuspendedFrames; // not reset on standby
+
+    // mHapticChannelMask and mHapticChannelCount will only be valid when the thread support
+    // haptic playback.
+    audio_channel_mask_t            mHapticChannelMask = AUDIO_CHANNEL_NONE;
+    uint32_t                        mHapticChannelCount = 0;
 private:
     // mMasterMute is in both PlaybackThread and in AudioFlinger.  When a
     // PlaybackThread needs to find out if master-muted, it checks it's local