diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 9d9acc3..c3b4772 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1230,6 +1230,7 @@
 	}
 
 	nr_sectors = 0;
+	sync_blocks = 0;
 	do {
 		struct page *page;
 		int len = PAGE_SIZE;