diff --git a/services/surfaceflinger/DisplayDevice.h b/services/surfaceflinger/DisplayDevice.h
index eefc107..748be1a 100644
--- a/services/surfaceflinger/DisplayDevice.h
+++ b/services/surfaceflinger/DisplayDevice.h
@@ -119,6 +119,8 @@
     int32_t                 getHwcDisplayId() const { return mHwcDisplayId; }
     const wp<IBinder>&      getDisplayToken() const { return mDisplayToken; }
 
+    status_t prepareFrame(const HWComposer& hwc) const;
+
     void swapBuffers(HWComposer& hwc) const;
     status_t compositionComplete() const;