Paul Onuachu scored his 23rd goal in the Belgian First Division A on Wednesday but it was not enough as Genk suffered a 3-1 loss against KV Oostende.
The 26-year-old opened the scoring for Genk in the 10th minute after slotting his strike past goalkeeper Guillaume Hubert from the penalty spot.
Shortly after his opener, Senegal striker Makhtar Gueye grabbed an equaliser for the hosts from the penalty spot in the 22nd minute and he also fired them into the lead, four minutes later with another strike from the spot.
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KV Oostende completed the comeback courtesy of Arthur Theate's 58th-minute goal as they secured back-to-back league wins at the Diaz Arena.