Alpine’s double world champion Fernando Alonso lost seventh place at the US Grand Prix on Sunday after stewards upheld a protest from Formula One rivals Haas about the safety of his car.

Renault-owned Alpine, who are fighting McLaren for fourth in the constructors’ championship with prize money at stake, responded by protesting the admissibility of the Haas protest.

Haas, who are eighth and only two points clear of AlphaTauri, had objected postrace to Alonso and Red Bull’s Sergio Perez, who finished fourth, being allowed to continue racing at Austin’s Circuit of the Americas with loose bodywork.

Stewards rejected the protest against Red Bull but upheld the one against Alpine, dropping Alonso to 15th with a 30-second post-race penalty.

Haas had argued that Alonso’s car was in an unsafe condition after a collision because the right-hand mirror, which eventually fell off, was moving around.

They also made the point they had been shown a black and orange flag, requiring a driver to pit due to mechanical problems or loose bodywork, on three occasions this season.

Technical chiefs for the governing FIA told stewards the car was unsafe to be driven with a flapping mirror and after it had fallen off.

Writing in their verdict, the stewards noted that they were “deeply concerned that Car 14 (Alonso) was not given the black and orange flag (shown to a competitor judged to have suffered mechanical damage that requires immediate attention in the pits), or at least a radio call to rectify the situation, despite… two calls to Race Control by the Haas Team.

“Notwithstanding the above, Article 3.2 of the Formula 1 Sporting Regulations is clear a car must be in a safe condition throughout a race, and in this case, Car 14 was not. This is a responsibility of the Alpine Team.”

“Therefore the penalty should be considered as invalid,” the team said in a statement. “As a result of thispoint, the team has protested the admissibility of the original Haas F1 team protest.”

Alpine would have scored six points for Alonso’s seventh place but instead ended up with just one for Esteban Ocon being bumped up to 10th.

Without Alonso’s points, Alpine are only six clear of McLaren with three races remaining.