Ryan Jarvis scored in injury time to clinch a win for Leyton Orient against play-off rivals Peterborough.
Ryan Bennett had an early header ruled out for Posh, as James Wesolowski had fouled Adam Barrett in the build-up.
Orient went ahead when Stephen Dawson drove in a cross and Gabriel Zakuani poked the ball past his own goalkeeper.
Nathaniel Mendez-Laing headed in a Grant McCann corner to equalise for Posh, before Jarvis nodded in a Jason Crowe cross to win it for Orient.
Peterborough are now six points behind second-placed Huddersfield, whilst Orient move to within two points off the play-off places.