Mike Fondop scored his fifth goal of the season as Oldham secured a third consecutive Vanarama National League win by beating in-form Forest Green 1-0.
Cameroonian striker Fondop fired home a first-time finish to give Micky Mellon’s Latics a ninth-minute lead at Boundary Park.
Forest Green almost equalised just three minutes later when Teddy Jenks struck a post from distance.
Steve Cotterill’s visitors, who began the day level on points with leaders Barnet, were unable to find a leveller as they slipped to a first defeat in eight matches.