Prospective Boston Marathon runners looking to participate in next year’s event will be allowed to enter as nonbinary athletes without having to register as a member of the men’s or women’s divisions.

The Boston Athletic Association (BAA) made the announcement Monday as registration opened for the April 2023 event. A field of about 30,000 runners are expected to participate in the 127th running.

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Boston Marathon runners in 2021

Runners cross the starting line of the 125th Boston Marathon, Monday, Oct. 11, 2021, in Hopkinton, Massachusetts. (AP Photo/Mary Schwalm, File)

"The Boston Athletic Association is currently working on expanding opportunities for non-binary athletes at our events, including the upcoming 2023 Boston Marathon. While we do not currently have qualifying standards for nonbinary athletes, we are working on ways nonbinary participants are accepted into the event," the BAA said on its registration page.

"Non-binary athletes who have completed a marathon as a non-binary participant during the current qualifying window (September 1, 2021 through September 16, 2022) may submit an entry application into the 2023 Boston Marathon between September 12-16, 2022. Entry into the event will be determined by an athlete’s submitted time and based on the Boston Marathon’s overall field size limit. The Boston Marathon registration application will feature the option to select non-binary in regards to gender."

Boston Marathon fans in 2022

Spectators look out of their window during the 126th Boston Marathon on April 18, 2022, in Boston. (Omar Rawlings/Getty Images)

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Nikki Hiltz, a nonbinary pro miler and 1,500 runner who came out as transgender last year and nearly missed a spot on the U.S. team for the Tokyo Olympics, praised the move in a tweet.

"There’s still so much work to be done but I’m thrilled that nonbinary runners are being acknowledged by the Boston Marathon and @BAA," Hiltz wrote.

The Philadelphia Distance Run was the first large race in the U.S. to establish a nonbinary division and offer equal prize money. The event did that last year.

Boston Marathon sprinters cross the logo

Athletes compete in the 126 Boston Marathon on April 18, 2022, in Boston. (Lauren Owens Lambert/Anadolu Agency via Getty Images)

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The Brooklyn Marathon and Half Marathon did it earlier this year.

The Associated Press contributed to this report.