Ghanaian striker Eric Ocansey scored his season's fifth league goal for Eupen who lost 3-2 at home to Anderlecht.
The Tema-born found the back of the net on 90 minutes to reduce the deficit but it was late for his side to engineer a comeback.
Anderlecht were fortunate to go ahead courtesy two own goals from Mbaye Leye and Moussa Wague (33)
Ocansey was making his 11th appearance for the club who lie second bottom on the table.