diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index a5cf4e8d68187e5bd5e7892effc0957dc5bfea0b..f9bfe526d3102175ab3d32149966f61aab35da62 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -173,6 +173,9 @@ struct mtd_info {
 	/* ECC layout structure pointer - read only! */
 	struct nand_ecclayout *ecclayout;
 
+	/* the ecc step size. */
+	unsigned int ecc_step_size;
+
 	/* max number of correctible bit errors per ecc step */
 	unsigned int ecc_strength;