diff --git a/include/private/media/AudioTrackShared.h b/include/private/media/AudioTrackShared.h
index fe258ad..395f164 100644
--- a/include/private/media/AudioTrackShared.h
+++ b/include/private/media/AudioTrackShared.h
@@ -256,6 +256,8 @@
         return mEpoch;
     }
 
+    size_t      getFramesFilled();
+
 private:
     size_t      mEpoch;
 };