diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index 16629382a787..6158452be24d 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -1083,6 +1083,7 @@ static int mtd_otp_nvmem_add(struct mtd_info *mtd)
 
 err:
 	nvmem_unregister(mtd->otp_user_nvmem);
+	mtd->otp_user_nvmem = NULL;
 	/* Don't report error if OTP is not supported. */
 	if (err == -EOPNOTSUPP)
 		return 0;