diff --git a/verify.h b/verify.h
index dba7743..bb3fd49 100644
--- a/verify.h
+++ b/verify.h
@@ -76,8 +76,8 @@
  */
 extern void populate_verify_io_u(struct thread_data *, struct io_u *);
 extern int __must_check get_next_verify(struct thread_data *td, struct io_u *);
-extern int __must_check verify_io_u(struct thread_data *, struct io_u *);
-extern int verify_io_u_async(struct thread_data *, struct io_u *);
+extern int __must_check verify_io_u(struct thread_data *, struct io_u **);
+extern int verify_io_u_async(struct thread_data *, struct io_u **);
 extern void fill_verify_pattern(struct thread_data *td, void *p, unsigned int len, struct io_u *io_u, unsigned long seed, int use_seed);
 extern void fill_buffer_pattern(struct thread_data *td, void *p, unsigned int len);
 extern void fio_verify_init(struct thread_data *td);