diff --git a/profile.h b/profile.h
index 3c8d61f..de35e9b 100644
--- a/profile.h
+++ b/profile.h
@@ -10,8 +10,8 @@
 	int (*td_init)(struct thread_data *);
 	void (*td_exit)(struct thread_data *);
 
-	int (*fill_io_u_off)(struct thread_data *, struct io_u *);
-	int (*fill_io_u_size)(struct thread_data *, struct io_u *);
+	int (*fill_io_u_off)(struct thread_data *, struct io_u *, unsigned int *);
+	int (*fill_io_u_size)(struct thread_data *, struct io_u *, unsigned int);
 	struct fio_file *(*get_next_file)(struct thread_data *);
 
 	int (*io_u_lat)(struct thread_data *, uint64_t);