diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 5ea5bca..3886357 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -2161,10 +2161,10 @@
 	int d, d2, err;
 
 	/* Cannot change chunk_size, layout, or level */
-	if (mddev->chunk_size != mddev->new_chunk ||
+	if (mddev->chunk_sectors << 9 != mddev->new_chunk ||
 	    mddev->layout != mddev->new_layout ||
 	    mddev->level != mddev->new_level) {
-		mddev->new_chunk = mddev->chunk_size;
+		mddev->new_chunk = mddev->chunk_sectors << 9;
 		mddev->new_layout = mddev->layout;
 		mddev->new_level = mddev->level;
 		return -EINVAL;