diff --git a/block/blk-merge.c b/block/blk-merge.c
index 1dced51de1c6ce24cc387a911269c144dfd961cf..2776ee6c5c3dcf468269c60199ed5c3ea78e682f 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -774,7 +774,7 @@ static struct request *attempt_merge(struct request_queue *q,
 
 	req->__data_len += blk_rq_bytes(next);
 
-	if (req_op(req) != REQ_OP_DISCARD)
+	if (!blk_discard_mergable(req))
 		elv_merge_requests(q, req, next);
 
 	/*