Pierre-Emerick Aubameyang scored the only goal of the game as St Etienne took maximum points from their home encounter against Dijon.
Having dominated large parts of the opening half, the home side eventually broke the deadlock in the 43rd minute.
Josua Guilavogui produced a through ball for Aubameyang, who took one touch before sending a left footed shot into the bottom right hand corner of the net.
The hosts continued to dominate after the restart, but they were unable to convert their domination into further goals.
Aubameyang had their best chance to extend the lead, but he struck the woodwork from six yards out.
