diff --git a/services/surfaceflinger/SurfaceFlingerConsumer.h b/services/surfaceflinger/SurfaceFlingerConsumer.h
index d3f0070..7713ed2 100644
--- a/services/surfaceflinger/SurfaceFlingerConsumer.h
+++ b/services/surfaceflinger/SurfaceFlingerConsumer.h
@@ -33,6 +33,7 @@
     static const status_t BUFFER_REJECTED = UNKNOWN_ERROR + 8;
 
     struct ContentsChangedListener: public FrameAvailableListener {
+        virtual void onBuffersReleased() = 0;
         virtual void onSidebandStreamChanged() = 0;
     };
 
@@ -89,6 +90,7 @@
             FrameEventHistoryDelta* outDelta) override;
 
 private:
+    virtual void onBuffersReleased();
     virtual void onSidebandStreamChanged();
 
     wp<ContentsChangedListener> mContentsChangedListener;