diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 0fa3301..36a6eac 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -672,7 +672,7 @@
 extern void blk_run_queue(request_queue_t *);
 extern void blk_start_queueing(request_queue_t *);
 extern int blk_rq_map_user(request_queue_t *, struct request *, void __user *, unsigned long);
-extern int blk_rq_unmap_user(struct request *);
+extern int blk_rq_unmap_user(struct bio *);
 extern int blk_rq_map_kern(request_queue_t *, struct request *, void *, unsigned int, gfp_t);
 extern int blk_rq_map_user_iov(request_queue_t *, struct request *,
 			       struct sg_iovec *, int, unsigned int);