Wing Eli Walker scored the second-half try which gave the Ospreys a hard-earned 19-10 RaboDirect Pro12 victory over Leinster at the Liberty Stadium.
Outside-half Matthew Morgan kicked 14 points including a late drop-goal which denied Leinster, who had led 10-0 inside 10 minutes, a losing bonus point.
Leinster's points in the first half came through a converted try by Leo Auva'a and a penalty from Ian Madigan.
The Ospreys' win means they leapfrog Leinster into fifth place in the table.
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