Substitute Edinson Cavani scored with four minutes remaining as holders Paris Saint-Germain beat Saint-Etienne 1-0 in the Coupe de la Ligue round of 16 on Wednesday.
Zlatan Ibrahimovic hit the crossbar with a brilliant volley in a first half that produced few other clear opportunities.
PSG had most of the play at Parc des Princes, but had to wait until late on to score the decisive goal when Cavani's first-time finish from fellow substitute Angel di Maria's cross won the match to seal a place in the quarter-finals.
Laurent Blanc's men are now unbeaten in 20 domestic matches this season and knock Saint-Etienne out of the competition for the third consecutive year as they look to win a third consecutive Coupe de la Ligue crown.
It was Ibrahimovic who brought the tie to life with a brilliant effort. Ezequiel Lavezzi's cross from the right was only headed partially away by Nathan Dekoke and the Sweden international unleashed a stunning acrobatic volley that bounced away off the frame of the goal.
And the two substitutes combined when the former Manchester United midfielder's floated pass was volleyed over by Cavani as PSG continued to struggle to test Moulin, despite dominating possession.
Saint-Etienne had barely threatened going forward, but they almost sealed a huge upset late on when Hugo Roussey latched on to Corgnet's pass and saw his shot sharply saved by Salvatore Sirigu.
But the visitors' hearts were broken by Cavani. Di Maria's impressive cameo continued with an outstanding high pass from the right, finding the Uruguay striker in his stride to slot a first-time side-footed effort into the far corner - his 13th goal of the season.
