Top American sprinter Allyson Felix will double up at July’s US trials in hopes of competing in both the 200 and 400 metres at the Rio Olympics, her coach told Reuters.

The Olympic 200m gold medallist and world 400m champion has long wanted to challenge the rare Olympic double but will need a schedule change to make it possible in 2016.

“The Olympic Trials schedule is fine and I am working with USA Track & Field on the Olympic schedule,” her coach, Bob Kersee, said.

The current Rio schedule would make the double a daunting challenge. Felix would need to compete in the first round of the 200m 75 minutes before the 400m final.

“That’s unfair,” Kersee said. “Hopefully they will look at that.”

Only twice has a female athlete won both the 200m and 400m at the Olympics. Kersee-coached Valerie Brisco-Hooks claimed the double at the 1984 Games and France’s Marie-Jose Perec won both at the 1996 Olympics.

“Adjusting the schedule in my opinion does not hurt anybody,” said Kersee, who has frequently proposed 200-400 metres runners be given the same chance that 100-200m sprinters have in the Olympics.

USA Track & Field has been in discussions with the International Association of Athletics Federations (IAAF) concerning a change and will be filing a formal request, a spokeswoman said.

“All our training is toward her doing both,” Kersee said.

“We are going to double at our Olympic trials and try and make the team in the 4 and the 2.”