Darren Carter scored a last-minute winner from 25 yards as Preston beat relegation rivals Leicester.
New signing Craig Beattie should have scored after 32 seconds after being played through on goal but Foxes keeper Paul Henderson make a superb block.
Leicester's Patrick Kisnorbo shot over from the edge of the area, while Matty Fryatt twice had the ball in the net but both were ruled out for offside.
Carter struck before Richard Stearman had a third Leicester effort ruled out.
Leicester boss Ian Holloway:
"All it does is add more pressure to a situation where there was already a lot of pressure.
"Some local newspapers were saying that if we won this game we would be out of sight - what a load of rubbish.
"We still need between 50 and 52 points to be safe, we just have one fewer game to achieve it, that's all."
Preston boss Alan Irvine:
"We thought we were only going to get a point, which would have been better than no points.
"But at this stage of the season we need to be picking up as many three points' as we possibly can.
"This is a big three points because of how close we are to Leicester now and the other clubs down at the bottom."
Leicester: Henderson, Stearman, N'Gotty, Kisnorbo, Clapham, Hume, Oakley, Clemence (Mattock 59), Hendrie, Campbell (Fryatt 71), Howard (Hayles 71).
Subs Not Used: James Chambers, McAuley.
Preston: Lonergan, St. Ledger, Mawene, Chilvers, Hill, Sedgwick, McKenna, Carter, Whaley (Lewis Neal 77), Brown, Beattie (Mellor 38).
Subs Not Used: Chris Neal, Hawley, Jones.
Booked: Hill, St. Ledger.
Goals: Carter 90.
Ref: Roger East (Wiltshire).