diff --git a/services/audioflinger/Threads.h b/services/audioflinger/Threads.h
index a0b53cb..207f1eb 100644
--- a/services/audioflinger/Threads.h
+++ b/services/audioflinger/Threads.h
@@ -762,7 +762,7 @@
     bool        mFlushPending;
     size_t      mPausedWriteLength;     // length in bytes of write interrupted by pause
     size_t      mPausedBytesRemaining;  // bytes still waiting in mixbuffer after resume
-    Track       *mPreviousTrack;         // used to detect track switch
+    wp<Track>   mPreviousTrack;         // used to detect track switch
 };
 
 class AsyncCallbackThread : public Thread {