Force India stayed ahead of Williams in the Formula One constructors' standings after a post-race protest at the Singapore Grand Prix on Sunday.
Force India's Adrian Sutil, who had finished eighth, was first handed a 20-second penalty for having gained an advantage on lap one by going off the track. That dropped the German down to 10th.
His team, as well as protesting against that decision, also complained that Williams' ninth placed Nico Hulkenberg had cut a corner.
Stewards imposed a 20-second penalty on Williams' German, lifting Sutil back to ninth and dropping Hulkenberg to 10th instead.
Ferrari's Brazilian Felipe Massa meanwhile moved up from 10th to eighth after he started on the back row of the grid.
Force India are sixth overall, four points clear of Williams.