diff --git a/block/blk.h b/block/blk.h
index 49d21af..c8db371 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -103,6 +103,8 @@
 		      struct bio *bio);
 int attempt_back_merge(struct request_queue *q, struct request *rq);
 int attempt_front_merge(struct request_queue *q, struct request *rq);
+int blk_attempt_req_merge(struct request_queue *q, struct request *rq,
+				struct request *next);
 void blk_recalc_rq_segments(struct request *rq);
 void blk_rq_set_mixed_merge(struct request *rq);