-void *std_heap = NULL; /* memory erased each time the MC stuff rollbacks to the beginning. Almost everything goes here */
-void *mc_heap = NULL; /* memory persistent over the MC rollbacks. Only MC stuff should go there */
+xbt_mheap_t std_heap = NULL; /* memory erased each time the MC stuff rollbacks to the beginning. Almost everything goes here */
+xbt_mheap_t mc_heap = NULL; /* memory persistent over the MC rollbacks. Only MC stuff should go there */