diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 5b5c62712814e37264af04eee92f0b379c9c9741..4b7e0287b48fa9010692a935ed563e4241a92b04 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -4035,7 +4035,7 @@ int nand_scan_tail(struct mtd_info *mtd)
 		 */
 		if (!ecc->size && (mtd->oobsize >= 64)) {
 			ecc->size = 512;
-			ecc->bytes = 7;
+			ecc->bytes = DIV_ROUND_UP(13 * ecc->strength, 8);
 		}
 		ecc->priv = nand_bch_init(mtd, ecc->size, ecc->bytes,
 					       &ecc->layout);