diff --git a/drivers/mtd/mtdconcat.c b/drivers/mtd/mtdconcat.c
index b9000563b9f4..d85c9468d30c 100644
--- a/drivers/mtd/mtdconcat.c
+++ b/drivers/mtd/mtdconcat.c
@@ -311,7 +311,8 @@ concat_write_oob(struct mtd_info *mtd, loff_t to, struct mtd_oob_ops *ops)
 			devops.len = subdev->size - to;
 
 		err = mtd_write_oob(subdev, to, &devops);
-		ops->retlen += devops.oobretlen;
+		ops->retlen += devops.retlen;
+		ops->oobretlen += devops.oobretlen;
 		if (err)
 			return err;