diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 9d9acc3e51a7..c3b4772cfaea 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1230,6 +1230,7 @@ static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, i
 	}
 
 	nr_sectors = 0;
+	sync_blocks = 0;
 	do {
 		struct page *page;
 		int len = PAGE_SIZE;