diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 704ef7fcfbf8..c13921adec93 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -7015,8 +7015,8 @@ static int run(struct mddev *mddev)
 		}
 
 		if (discard_supported &&
-		   mddev->queue->limits.max_discard_sectors >= stripe &&
-		   mddev->queue->limits.discard_granularity >= stripe)
+		    mddev->queue->limits.max_discard_sectors >= (stripe >> 9) &&
+		    mddev->queue->limits.discard_granularity >= stripe)
 			queue_flag_set_unlocked(QUEUE_FLAG_DISCARD,
 						mddev->queue);
 		else