After a month of in-fighting, the two rivals battling to lead France’s centre-right UMP party have agreed to hold a re-run of the election.
The independently-organised poll will be held sometime before next October.
The announcement of a deal came after a number of meetings between the two rivals.
Jean Francois Copé was declared winner of the original vote in November, but this was challenged by Francois Fillon, who formed his own breakaway group.
The party is expected to rally together before the vote, due to take place after next summer’s parliamentary recess.
The fall-out from the dispute is thought to have seriously undermined the UMP, France’s main opposition party.