The 21-year-old found the back of the net three minutes from time at the Štadión Antona Malatinského.
He had come on in the 76th minute to replace Milan Ristovski.
Boateng has now scored three goals in eight appearances for the Slovakia Fortuna Liga leaders.
Spartak Trnava scored their opener through Saymon Cabral in the 7th minute. Read Full Story
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