diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 8396db2..d18ee67 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -697,6 +697,7 @@
 extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *,
 				  struct request *, int, rq_end_io_fn *);
 extern int blk_verify_command(unsigned char *, int);
+extern void blk_unplug(struct request_queue *q);
 
 static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
 {