Haas team driver Romain Grosjean was disqualified from the Italian Grand Prix on Sunday after a successful Renault protest about the legality of the Frenchman's car.
Grosjean's sixth-place finish in Monza had meant Haas claimed a coveted fourth place in the constructors' standings at the expense of Renault, who saw Carlos Sainz Jr finish ninth.
Renault subsequently lodged a complaint focusing on "a small detail on the leading edge of the floor" of the Ferrari-powered Haas car.
After an inspection by race stewards, the protest was upheld.
Grosjean was disqualified, losing eight points in the process. Haas dropped from fourth to fifth in the constructors' standings behind Renault.