Guingamp made it three wins in a row with a last-ditch 2-1 victory over lowly Ajaccio at the Stade Roudourou.
Despite falling behind to a first-half Benjamin Andre effort, the hosts bounced back with a Claudio Beauvue strike and an injury-time winner from Moustapha Diallo to move up to fifth in the Ligue 1 table.
Defeat for Ajaccio means the Corsicans are yet to taste victory on the road this season and, with just one win to their name, Fabricio Ravanelli's men remain in the bottom three.
Guingamp went close early on when Fatih Atik tested Guillermo Ochoa from the edge of the area but the Mexican keeper tipped the ball over his own crossbar.
Ajaccio responded but Paul Lasne's effort from 20 yards failed to find the target before Benoit Pedretti beat the wall with a direct free-kick only for Guy Ndy Assembe to punch clear.
Chances were few and far between in the opening half hour but Atik went close again as half-time approached when he met Steven Langil's cross but the striker blazed over Ochoa's bar.
Guingamp's wastefulness proved costly though when Ajaccio took the lead with four minutes left in the opening half.
Pedretti swung a free-kick in from the right and picked out Andre at the far post who headed past Ndy Assembe to give his side a fortunate half-time lead.
Guingamp came out fighting after the break and only a superb reflex save from Ochoa prevented Christophe Mandanne from grabbing an equaliser with a point-blank header on 55 minutes.
The hosts continued to press and Dorian Leveque went close with a good effort on the turn from 25 yards which shaved Ochoa's left post before the goalkeeper was called upon yet again to keep out Mandanne as Jocelyn Gourvennec's men began to turn the screw.
Ajaccio hearts were finally broken in stunning style with less than five minutes left to play when the visitors failed to deal with a corner and Atik knocked the ball into the path of Beauvue who acrobatically steered the ball beyond Ochoa for a deserved equaliser.
There was still time for a final twist in the tail though as Guingamp's efforts paid off in jury time when Diallo grabbed a winner.
Yatabare made progress down the right before sending a ball into the area and the big Senegalese midfielder rose highest to head beyond Ochoa much to the annoyance of Ravanelli.