Thailand’s Constitutional Court on Wednesday ruled a law that defines marriage as between a man and a woman in the country is constitutional.

The Foundation for Sexual Orientation and Gender Identity Rights and Justice, a Thai advocacy group, filed a lawsuit that challenged Section 1448 of the country’s Civil and Commercial Code, which does not extend marriage rights to same-sex couples. Bloomberg said the Constitutional Court in its ruling said Thai lawmakers “should draft laws that guarantee the rights for gender diverse people.”

Taiwan in 2019 became the first country in Asia to extend marriage rights to same-sex couples.

The Thai Cabinet in 2018 approved a bill that would allow same-sex couples to enter into civil unions. The government last year backed a second version of the measure.

Tunyawaj Kamolwongwat, a Thai MP who is a member of the Move Forward Party, has introduced a marriage equality bill.