Danny Carey-Bertram's 14th goal of the season was enough to give Telford all three points away at Blue Square North leaders Tamworth.
The Bucks frontman converted a first half penalty at The Lamb after Dominic Langden handled inside the area.
The result sees Telford close the gap on top spot to just three points.
Telford boss Rob Smith told BBC Radio Shropshire: "It was a must not lose game for us as every win is massive. I thought we showed a lot of character."
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