diff --git a/services/surfaceflinger/Layer.h b/services/surfaceflinger/Layer.h
index 046482c..3763c58 100644
--- a/services/surfaceflinger/Layer.h
+++ b/services/surfaceflinger/Layer.h
@@ -899,6 +899,8 @@
 
     // Layer bounds in screen space.
     FloatRect mScreenBounds;
+
+    void setZOrderRelativeOf(const wp<Layer>& relativeOf);
 };
 
 } // namespace android