diff --git a/block/blk-core.c b/block/blk-core.c
index f2732f106a2e..3c5f61ceeb67 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -661,7 +661,6 @@ bool bio_attempt_discard_merge(struct request_queue *q, struct request *req,
  * blk_attempt_plug_merge - try to merge with %current's plugged list
  * @q: request_queue new bio is being queued at
  * @bio: new bio being queued
- * @request_count: out parameter for number of traversed plugged requests
  * @same_queue_rq: pointer to &struct request that gets filled in when
  * another request associated with @q is found on the plug list
  * (optional, may be %NULL)