diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index de63a1f..08e1734 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -402,7 +402,8 @@
 		  "%s does not support generic reshape\n", __func__);
 
 	rdev_for_each(rdev, mddev)
-		array_sectors += rdev->sectors;
+		array_sectors += (rdev->sectors &
+				  ~(sector_t)(mddev->chunk_sectors-1));
 
 	return array_sectors;
 }