diff --git a/libs/gui/LayerState.cpp b/libs/gui/LayerState.cpp
index 39f8f92..ccf8b78 100644
--- a/libs/gui/LayerState.cpp
+++ b/libs/gui/LayerState.cpp
@@ -67,7 +67,7 @@
 }
 
 status_t ComposerState::write(Parcel& output) const {
-    output.writeStrongBinder(client->asBinder());
+    output.writeStrongBinder(IInterface::asBinder(client));
     return state.write(output);
 }
 
@@ -79,7 +79,7 @@
 
 status_t DisplayState::write(Parcel& output) const {
     output.writeStrongBinder(token);
-    output.writeStrongBinder(surface != NULL ? surface->asBinder() : NULL);
+    output.writeStrongBinder(IInterface::asBinder(surface));
     output.writeInt32(what);
     output.writeInt32(layerStack);
     output.writeInt32(orientation);