diff --git a/services/audioflinger/AudioFlinger.h b/services/audioflinger/AudioFlinger.h
index 9023b2d..63898a0 100644
--- a/services/audioflinger/AudioFlinger.h
+++ b/services/audioflinger/AudioFlinger.h
@@ -604,7 +604,7 @@
         virtual status_t standby();
 
     private:
-        sp<MmapThread> mThread;
+        const sp<MmapThread> mThread;
     };
 
               ThreadBase *checkThread_l(audio_io_handle_t ioHandle) const;