diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index 0a85085fe697..bce0a07cbac9 100644
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -373,7 +373,7 @@ static int mtd_do_writeoob(struct file *file, struct mtd_info *mtd,
 	if (!mtd->write_oob)
 		ret = -EOPNOTSUPP;
 	else
-		ret = access_ok(VERIFY_READ, ptr, length) ? 0 : EFAULT;
+		ret = access_ok(VERIFY_READ, ptr, length) ? 0 : -EFAULT;
 
 	if (ret)
 		return ret;