Finn Harps slipped to fourth place in the table after going down to Longford Town last night.
A 25th minute controversial penalty was all that separated the sides in a pretty dour affair.
Harps have secured just one point from a possible nine in their last three league games.
Manager Ollie Horgan will be concerned about the lack of chances his side is creating up front with the continued loss of Kevin McHugh through injury.
The turning point in the game came in the 25th minute when Packie Mailey was harshly adjudged to have handled the ball inside the area.
O’Sullivan converted and despite a number of attempts, Harps failed to get back on level terms.
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