Red Bull will be forced to make changes to their cars for next weekend's Formula One Canadian Grand Prix.
There was speculation prior to last Sunday's race in Monaco that a protest would be lodged against the design of the RB8 - in particular the holes in the floor in front of the rear wheels, which have been declared illegal by the FIA.
The world governing body of motor sport has sent a technical directive to Red Bull and all other teams informing them that the car must be changed for the race in Montreal.
Red Bull felt there was a grey area in the rules and that the regulations did not specify that holes in that area of the car were banned, but in the technical directive the FIA say "we disagree with this view and consider it implicit that fully enclosed holes may not be located there".
Red Bull team principal Christian Horner was confident the car would be deemed "fully compliant" when he was asked about this issue last weekend.
"There was a bit of a fuss after the Bahrain race but it was clear the car complied," he said.
"We sought clarification after that, but there is no doubt the car is fully compliant.
"The car is identical to that which ran in Barcelona and Malaysia as well. There are other cars running in similar situations.
"As I say, we're totally comfortable with the car, that it complies with the regulations and we're not going to change it."
Asked then if the FIA shared his view, Horner said: "Yes. They wouldn't have passed the car in scrutineering. We wouldn't have had a debate and discussions in Barcelona.
"We're certainly comfortable this car is fully compliant."