diff --git a/services/surfaceflinger/LayerProtoHelper.h b/services/surfaceflinger/LayerProtoHelper.h
index 1754a3f..502238d 100644
--- a/services/surfaceflinger/LayerProtoHelper.h
+++ b/services/surfaceflinger/LayerProtoHelper.h
@@ -43,6 +43,7 @@
     static void writeToProto(const InputWindowInfo& inputInfo,
                              const wp<Layer>& touchableRegionBounds,
                              std::function<InputWindowInfoProto*()> getInputWindowInfoProto);
+    static void writeToProto(const mat4 matrix, ColorTransformProto* colorTransformProto);
 };
 
 } // namespace surfaceflinger