diff --git a/services/audioflinger/Threads.h b/services/audioflinger/Threads.h
index 17acb16..d4fb995 100644
--- a/services/audioflinger/Threads.h
+++ b/services/audioflinger/Threads.h
@@ -1013,6 +1013,8 @@
                     mDownStreamPatch = *patch;
                 }
 
+                PlaybackThread::Track* getTrackById_l(audio_port_handle_t trackId);
+
 protected:
     // updated by readOutputParameters_l()
     size_t                          mNormalFrameCount;  // normal mixer and effects