Former U.S. track and field star Michael Johnson pushed back on accusations of racism after he questioned the accuracy of some finishing times at the World Athletics Championships.

Johnson’s skepticism came to light as Nigeria’s Tobi Amusan set a world record in 100-meter hurdles semifinals with a time of 12.12 seconds. She was even faster in the wind-aided finals. She had previously finished fourth at the Olympics last year and fourth at the world championships in 2019.

It was not exactly the record-breaking performance that raised eyebrows, but it was everyone else in race scoring personal bests, according to The New York Times.