+#if defined(SGEN_SIMPLE_NURSERY)
+
+#ifdef SGEN_SIMPLE_PAR_NURSERY
+/* Not supported with concurrent major yet */
+#define SERIAL_COPY_OBJECT simple_par_nursery_copy_object
+#define SERIAL_COPY_OBJECT_FROM_OBJ simple_par_nursery_copy_object_from_obj
+#else
+#ifdef SGEN_CONCURRENT_MAJOR
+#define SERIAL_COPY_OBJECT simple_nursery_serial_with_concurrent_major_copy_object
+#define SERIAL_COPY_OBJECT_FROM_OBJ simple_nursery_serial_with_concurrent_major_copy_object_from_obj
+#else
+#define SERIAL_COPY_OBJECT simple_nursery_serial_copy_object
+#define SERIAL_COPY_OBJECT_FROM_OBJ simple_nursery_serial_copy_object_from_obj
+#endif
+#endif