diff --git a/update_engine_client.cc b/update_engine_client.cc
index ffe16e4..41c53ee 100644
--- a/update_engine_client.cc
+++ b/update_engine_client.cc
@@ -176,7 +176,7 @@
 
   // Register marshaller
   dbus_g_object_register_marshaller(
-      NULL,
+      g_cclosure_marshal_generic,
       G_TYPE_NONE,
       G_TYPE_INT64,
       G_TYPE_DOUBLE,