A southern Missouri school district is ending a policy prohibiting same-sex couples from attending prom, a day after a national anti-discrimination group threatened to sue.

Scott County Central School District superintendent Alvin McFerren told The Associated Press Friday that the school board has agreed to revise a handbook policy that prohibits same-sex dates at school dances. McFerren says the policy was adopted 10-15 years ago because students were attending prom as couples simply to save money — the couples price was cheaper than the individual cost.

The Southern Poverty Law Center on Thursday threatened legal action on behalf of Stacy Dawson, a male student who wanted to attend prom with his boyfriend. McFerren says Dawson can attend the dance on April 20 with whomever he chooses.