diff --git a/block/blk-core.c b/block/blk-core.c
index a33870b1847bb70c6ef1937f7bef4e93bdf9c980..3c95c4d6e31afe057ebabeda36868682e8188329 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -2868,7 +2868,8 @@ static int plug_rq_cmp(void *priv, struct list_head *a, struct list_head *b)
 	struct request *rqa = container_of(a, struct request, queuelist);
 	struct request *rqb = container_of(b, struct request, queuelist);
 
-	return !(rqa->q <= rqb->q);
+	return !(rqa->q < rqb->q ||
+		(rqa->q == rqb->q && blk_rq_pos(rqa) < blk_rq_pos(rqb)));
 }
 
 /*