OXFORD City conceded five minutes into injury time as they were beaten 2-1 at Peterborough Sports.
The hosts saw Dan Jarvis blast a cutback over, while Corie Andrews was denied by the offside flag.
Andrews though gave the Hoops the lead eight minutes before half-time when a long ball from Andre Burley bounced over Michael Gash, allowing Andrews to roam into the box and find the bottom corner.
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Michael Gyasi shot just wide four minutes into the second half, while Josh Ashby almost curled a corner straight in.
The Turbines found a leveller with 12 minutes to go, as Mark Jones tapped in after Gyasi hit the post.
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Kai McKenzie-Lyle kept City in it with a save from a Gash volley, with Peter Crook then denying Andrews with a double save.
The home side went straight up the other end and grabbed a winner when Jarvis bundled in a Gyasi cross.