diff --git a/block/blk.h b/block/blk.h
index 56f33fb..c0486f6 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -347,8 +347,8 @@ void blk_free_ext_minor(unsigned int minor);
 #define ADDPART_FLAG_NONE	0
 #define ADDPART_FLAG_RAID	1
 #define ADDPART_FLAG_WHOLEDISK	2
-int bdev_add_partition(struct block_device *bdev, int partno,
-		sector_t start, sector_t length);
+int bdev_add_partition(struct gendisk *disk, int partno, sector_t start,
+		sector_t length);
 int bdev_del_partition(struct block_device *bdev, int partno);
 int bdev_resize_partition(struct block_device *bdev, int partno,
 		sector_t start, sector_t length);