An openly gay teen in Missouri has prevailed in his quest to attend prom with his boyfriend.

Stacy Dawson, 17, who attends Scott County Central High School in Sikeston was told last year that he would not be allowed to bring his boyfriend to prom.

Administrators pointed to the school's handbook, which mandates the gender of a student's guest: “[H]igh school students will be permitted to invite one guest, girls invite boys and boys invite girls.”

“Prom is an important milestone in high school, and I would be devastated if I'm not allowed to attend prom with my boyfriend,” Dawson said. “It isn't fair that a school can randomly disregard students' rights because it doesn't agree with who you want to take to prom.”

On Thursday, Valentine's Day, the Southern Poverty Law Center (SPLC) urged the school to reconsider its policy or face legal action.

“Denying Stacy's right to bring his boyfriend to prom is blatantly discriminatory and in violation of his constitutional rights,” said Alesdair Ittelson, staff attorney for the SPLC. “This unlawful policy reminds us that anti-gay sentiment still serves as a platform for schools to deny the rights of same-sex couples. We call upon the school district to end this unconstitutional policy and recognize Stacy's rights without further delay.”

On Friday, NBC News reported that administrators had reversed course.

“It was never intended to be a discriminatory thing,” said Alvin McFerren, Scott County Central School District superintendent. “We want an educational environment for all of our kids and we're not ever going to discriminate as to whether or not the board has the policy and we don't do that based on sexual orientation. Period.”

“I automatically told my boyfriend,” Dawson said. “He was just as happy as I was.”

Dawson added that his classmates “have been really supportive.”