Leicester hung on at Sheffield United to claim a fourth win in their last five league games.
Andy King's goal proved to be decisive and he scored when lifting the ball over keeper Steve Simonsen early on.
The Blades were denied an equaliser when keeper Chris Weale tipped over a venomous Nick Montgomerie strike.
Lee Williamson's measured free-kick also hit the Leicester post and Marcus Bent blazed over from six yards as the home side failed to grab an equaliser.
The Blades will be left ruing their poor finishing as Shane Lowry also headed over for them and later fired a shot over, while Elian Parrino had a late header cleared off the line.
The result was harsh on the home side considering their efforts but keeps them in the bottom three of the Championship with former Foxes manager Micky Adams still to taste victory since being appointed by the Blades in December.
Sheffield United were also dealt the blow of ex-Foxes left-back Joe Mattock being stretchered off with an injury after 28 minutes.
Meanwhile, Leicester kept within range of the promotion slots thanks to King's 11th goal of the campaign.
King's effort was set up when Ayegbeni Yakubu managed to prod the ball into his path, with his neat finish enough for the three points.
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