Mark Kitching nodded the Latics into the lead from Mike Fondop’s flick-on three minutes into the second half at Kuflink Stadium.
It was all square after Dominic Poleon sent Matthew Hudson the wrong way with an 81st-minute penalty.
Four minutes later, Khan restored Oldham’s lead from Jesurun Uchegbulam’s cross to wrap up all three points and a third consecutive victory for the visitors.
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