Nice returned to the top of Ligue 1 after Valentin Eysseric s strike against his former club sealed a 1-0 win at Saint-Etienne.
Eysseric, who spent last season on loan with Saint-Etienne, scored the winner on 63 minutes, firing a left-footed strike into the top corner after Jordan Veretout had lost possession in a dangerous area for the hosts.
Nice s victory which came without the suspended Mario Balotelli and injured captain Paul Baysse sees them restore a three-point gap over Monaco and Paris Saint-Germain at the top after both of their title rivals had won their games.
Lucien Favre s men had suffered their first league defeat of the season away to Caen last time out and avoided losing two straight league games – something they have not done since April 2015.
Ninth-placed Saint-Etienne have now won only one of their last six matches after a display that only saw them register one shot on target.
Alassane Plea fired off-target with two late opportunities and was then denied by home goalkeeper Stephane Ruffier as Nice sought a second goal.
The visitors main scare had come early on, when Dante almost scored an own goal with a sliced clearance.