diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
index 7d4ff1193db6..1a227c3b08b5 100644
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -1468,7 +1468,7 @@ static int ubi_mtd_param_parse(const char *val, const struct kernel_param *kp)
 	if (token) {
 		int err = kstrtoint(token, 10, &p->ubi_num);
 
-		if (err) {
+		if (err || p->ubi_num < UBI_DEV_NUM_AUTO) {
 			pr_err("UBI error: bad value for ubi_num parameter: %s\n",
 			       token);
 			return -EINVAL;