simcall_comm_isend(mailbox, request->size, -1.0,
request->buf, request->real_size,
&match_send,
- &smpi_mpi_request_free_voidp, // how to free the userdata if a detached send fails
+ &xbt_free, // how to free the userdata if a detached send fails
request,
// detach if msg size < eager/rdv switch limit
request->detached);