Felipe Massa's accident during second practice for the Chinese Grand Prix cost the Brazilian the only new front wing the Williams team had for him.
Massa lost control of his car under braking after the back straight during the second session, and although he avoided a big crash, he touched the barriers enough to damage the front wing.
Williams had brought an updated version for the Shanghai race, but it was the only one available for Massa.
The Williams driver said the accident was caused by the rear wing stalling under braking.
"During the braking I had a stall problem with the rear wing and the downforce didn't come back, so when I braked I had no grip from the rear, and that's why I spun," Massa said.
"Unfortunately I lost the second session because of that.
"They changed the rear wing for Valtteri after that problem and he never had the problem, which is positive for him but not for me because I lost the session and I lost the front wing, which was new.
"It was the only one we had so it's really a shame."