Recall that the Nigerian international has been on a ten-game goal drought, having failed to find the net for his side since August.
His form has seen him become a substitute for his Belgian side in recent matches.
Orban was introduced off the bench after 57 minutes, replacing fellow Nigerian star Jordan Torunarigha for the hosts.
He netted in the 69th minute as he calmly slotted his effort past the goalkeeper.
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Omri Gandelman had opened the scoring for Gent after only ten minutes before striker Hugo Cuypers scored twice in quick succession to put the Belgians up 3-0 by the 19th minute.
Tarik Tissoudali scored in the 43rd minute to make it 4-0 to the Belgian outfit at the break.
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