Burnley moved to within a point of Championship leaders Sheffield United by beating them at Bramall Lane.
Goals from captain Josh Brownhill and Zian Flemming either side of half-time were enough for Scott Parker's side.
In the meeting of the English Football League's two meanest defences, being clinical was key, and the Blades struggled to find their form in front of goal.
They dominated large parts of the game but suffered their first home league defeat of the season.