Second-placed Peterborough stretched their unbeaten run in League Two to nine matches to keep pace with leaders MK Dons.
Midfielder Dean Keates - the smallest player on the pitch at 5ft 6in - scored the winner after leaping at the far post to nod in Claude Gnakpa's cross.
However, Posh also had keeper Joe Lewis to thank for taking all three points.
He thwarted Paul Scott with a fingertip save in the first half and denied Andy Bishop after the break.
















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