Bali’s government is cracking down on tourists paying for goods and services using cryptocurrency, with the island’s governor sending a reminder that Indonesia’s fiat currency is the only legal tender.

On May 28, the government-owned news agency Antara reported that Bali Governor Wayan Koster hosted a press conference the same day and said tourists who “use crypto as a means of payment [...] will be dealt with firmly.”

“Strict actions range from deportation, administrative sanctions, criminal penalties, closure of business premises and other tough sanctions,” he added.

The meeting was attended by Bali’s chief police inspector and Trisno Nugroho, the head of the Bali Representative Office for Bank Indonesia — the country’s central bank.

Nugroho reaffirmed that trading crypto is allowed but the use of crypto for payments is banned.

Koster noted that Indonesia’s currency — the rupiah — is the only one that can be legally used for payments in the country. The use of other currencies carries a maximum potential sentence of one year in prison and a fine of 200 million rupiah ($13,000).

The Bali governor’s announcement comes days after a May 26 investigative report in Kompas, considered the country’s newspaper of record.