Jenson Button has been slapped with a three-place grid penalty for the United States GP after overtaking under red flags in Friday's first practice.
The opening practice at the Circuit of the Americas was shortened twice, first due to heavy fog and then again later when the red flags came out when it became apparent that the medical helicopter was not at the track.
Button, who was putting in the laps when the red flag was waved, failed to adhere to the regulations and overtook another car.
Called up by the stewards, the Brit was hit with a three-place grid penalty for Sunday's race.
Despite the penalty, Button was reasonably pleased with the McLaren's performance during Friday's practice.
"Both sessions today were quite positive," the former World Champion said.
"Our car's feeling reasonably good around here, and it's a fun circuit to drive, so I think we can make further progress. Hopefully we can qualify a little nearer to the front, too.
"However, that will be made more difficult due to my three-place grid penalty for overtaking under a red flag during FP1. It wasn't a dangerous situation, and I didn't do it on purpose - the other car slowed down - but the rules are the rules, and it was the wrong thing to do.
"Nonetheless, in terms of race-pace, I think we're looking reasonably good - we just need to extract the maximum qualifying performance from the car. It's a pity that I'll be starting three places further back - I haven't made it easy for myself in the past few races - but I'll be giving it everything I've got tomorrow."