The French supreme court has struck out two laws adopted by the French Polynesian assembly because not all of the debate was in French.
The two laws in question concerned pension provisions within the territory.
The court in Paris ruled that the laws were illegal because part of the debate was in Tahitian.
It says Tahitian is recognised to guarantee French Polynesia's identity and diversity and the French constitution upholds that all regional languages belong to the heritage of France.
But it also says that French has to be spoken within the assembly.