Dwain Chambers will run for Great Britain later this year, even though the sport's bosses don't want him to.
Chambers was first in the 60 metres at the British Indoor Championships at the weekend, earning him a place at the World Indoor Championships next month.
Chambers, 29, is just getting back into athletics after a two-year ban from the sport for taking drugs.
UK Athletics bosses would rather his place went to a younger athlete, so they could get more experience.
But under the rules the athlete who is first in the trial wins a place at the Worlds, so Chambers will be racing.
Now UK Athletics say they hope to change the rules in future, so they are allowed not to select athletes who have failed drugs tests in the past.
No Olympics for Chambers
Later this year the Olympic Games take place in China, and Chambers will not be allowed to run for Team GB in that event.
The teams for the Olympics are selected by the British Olympic Association, and their rules allow them not to select athletes who have failed drugs tests.