A bill to legalize same-sex marriage could face a vote in Thailand’s parliament as early as Wednesday. If it passes, the country will be the first in Southeast Asia to establish marriage rights for gay and lesbian couples.

The House of Representatives will take up the legislation, technically an amendment to the Civil and Commercial Code, for second and third readings when it meets at 9 a.m. Lawmakers may vote later in the day.

The bill would legalize marriage for same-sex partners aged 18 and above, along with rights to inheritance, tax allowances and child adoption, among others. Prime Minister Srettha Thavisin’s administration has made it a signature issue, and advocates say it would also burnish Thailand’s reputation as an LGBTQ-friendly tourist destination.