Invalid schema reference when using tuple struct

#[derive(Deserialize, ToSchema)]
#[allow(non_snake_case)]
pub(crate) enum DriveEncryptionType {
    AllowUserToChoose = 0,
    FullEncryption = 1,
    UsedSpaceOnlyEncryption = 2,
}

#[derive(Deserialize, ToSchema)]
#[allow(non_snake_case)]
pub(crate) struct FixedDrivesEncryptionType(DriveEncryptionType);

Above is the example rust code.

    "FixedDrivesEncryptionType": "AllowUserToChoose",

If I use this json field the schema validator complains
JSON doesn't match expected schema: Invalid reference: json-schema:///#/components/schemas/DriveEncryptionType
I have made sure the schema reference exists in swagger ui.