Andy King gave Championship leaders Leicester their sixth successive home win as they beat Brighton, who missed a second-half penalty.
Midfielder King scored the only goal of the game - a shot from close range after his initial effort was blocked.
Brighton won a penalty 10 minutes after the break when defender Zak Whitbread fouled Will Buckley.
But Kasper Schmeichel dived left to save the spot-kick from Ashley Barnes, who fired the follow-up over the bar.
The Foxes could have scored more after taking the lead.
Martyn Waghorn fired over from Ritchie De Laet's cross, before Anthony Knockaert forced a save from Tomasz Kuszczak.
The former Manchester United goalkeeper also made a great stop to keep out David Nugent's curling effort.
Brighton also created chances, Liam Bridcutt seeing his free-kick pushed wide by Schmeichel, while Craig Mackail-Smith, who had been quiet, was inches away from connecting with a cross from Bruno Saltor.
However, the result means Brighton have now failed to win in five games.
Leicester manager Nigel Pearson:
"After the draw at Birmingham it was important to get maximum points from this match and the Crystal Palace game coming up on Saturday.
"They are both tough matches and this league is pretty relentless. So all credit to the players.
"They have worked hard in games and on the training ground, to get us to where we are at the moment."
Brighton boss Gus Poyet:
"I have been saying the same thing for the last four or five weeks.
"No matter how you play, how well you pass the ball and keep the ball it is all about scoring goals.
"I am getting bored listening to myself because it is always the same. I don't try to put myself in a better position than we are.
"The table shows we lost 1-0 and it was the same last week and the week before."
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Live Text Commentary
Full Time The final whistle is blown by the referee.90:00 +4:41
Adam El-Abd gives away a free kick for an unfair challenge on Jamie Vardy. Direct free kick taken by Ben Marshall.90:00 +3:37
Ashley Barnes has an effort at goal from outside the box which misses left.90:00 +1:46
Free kick awarded for an unfair challenge on Lloyd Dyer by Gordon Greer. Free kick taken by Anthony Knockaert.89:36
The ball is delivered by Ben Marshall.89:13
Anthony Knockaert decides to take a short corner.87:27
Craig Mackail-Smith takes a shot. Kasper Schmeichel makes a comfortable save.85:01
Ben Marshall takes a shot. Save by Tomasz Kuszczak.84:18
Andy King takes a shot. Blocked by Adam El-Abd.82:53
The ball is sent over by Stephen Dobbie, clearance by Paul Konchesky. Liam Bridcutt takes the outswinging corner, Zak Whitbread manages to make a clearance. Short corner taken by Liam Bridcutt.80:16
Free kick awarded for a foul by Danny Drinkwater on Ashley Barnes. Liam Bridcutt delivers the ball from the free kick right-footed from left wing, save by Kasper Schmeichel.79:22
The ball is sent over by Bruno Saltor, Headed effort from deep inside the penalty area by Craig Mackail-Smith misses to the left of the goal.78:22
The ball is sent over by Ben Marshall.76:48
Direct free kick taken by Kasper Schmeichel.76:48 Substitution
Substitution Andrew Crofts goes off and Dean Hammond comes on.76:48
Unfair challenge on Zak Whitbread by Craig Mackail-Smith results in a free kick.73:56
Andy King produces a right-footed shot from deep inside the penalty box which goes wide of the left-hand upright.73:28
Wes Morgan takes a shot. Gordon Greer gets a block in.73:04
The ball is sent over by Ben Marshall, clearance made by Adam El-Abd.72:22
Inswinging corner taken from the right by-line by Anthony Knockaert, save by Tomasz Kuszczak.
Substitution Ben Marshall on for Martyn Waghorn.69:47
The ball is crossed by Lloyd Dyer, Headed effort from deep inside the area by Jamie Vardy misses to the right of the goal.68:45
Lloyd Dyer sends in a cross, clearance made by Gordon Greer.67:33 Substitution
Substitution Jamie Vardy is brought on as a substitute for David Nugent.66:13
Paul Konchesky takes the free kick.66:13 Booking
Booking Liam Bridcutt is cautioned by the ref for unsporting behaviour.66:04
Unfair challenge on Martyn Waghorn by Liam Bridcutt results in a free kick.65:34
Free kick awarded for a foul by Paul Konchesky on Will Buckley. Direct free kick taken by Liam Bridcutt.65:09
Martyn Waghorn gives away a free kick for an unfair challenge on Wayne Bridge. Free kick taken by Wayne Bridge.64:47
A cross is delivered by Stephen Dobbie, Kasper Schmeichel makes a save.61:54
Unfair challenge on Adam El-Abd by David Nugent results in a free kick. Free kick taken by Wayne Bridge.58:44
Direct free kick taken by Kasper Schmeichel.58:44 Substitution
Substitution Stephen Dobbie on for Gary Dicker.58:44
Craig Mackail-Smith gives away a free kick for an unfair challenge on Zak Whitbread.58:06
The ball is delivered by Liam Moore.56:49
Anthony Knockaert takes a shot. Blocked by Wayne Bridge. Liam Bridcutt gives away a free kick for an unfair challenge on Andy King. Strike on goal comes in from Anthony Knockaert from the free kick.56:35
The ball is delivered by Paul Konchesky, save by Tomasz Kuszczak.56:04
The ball is sent over by Martyn Waghorn, Headed effort from inside the area by Lloyd Dyer misses to the left of the target.54:32 Substitution
Substitution (Leicester) makes a substitution, with Liam Moore coming on for Ritchie De Laet.54:32
Ashley Barnes produces a right-footed shot from close in that goes over the bar.54:10 Penalty
Placed penalty taken by Ashley Barnes saved by Kasper Schmeichel. Leicester 1-0 Brighton.52:36 Booking
Booking Ritchie De Laet is given a yellow card.52:19
Zak Whitbread gives away a Penalty for an unfair challenge on Will Buckley.51:22
Lloyd Dyer delivers the ball, Adam El-Abd manages to make a clearance.50:51
Will Buckley produces a cross, clearance by Wes Morgan.49:42
Shot by David Nugent. Save by Tomasz Kuszczak.49:32
The ball is swung over by Ritchie De Laet.49:01
Free kick awarded for a foul by Adam El-Abd on Martyn Waghorn. Free kick taken by Anthony Knockaert.48:28
Liam Bridcutt fouled by Martyn Waghorn, the ref awards a free kick. Direct free kick taken by Adam El-Abd.47:45
Wayne Bridge sends in a cross, save by Kasper Schmeichel.46:44
The ball is crossed by Lloyd Dyer, blocked by Bruno Saltor.46:05
The offside flag is raised against Ashley Barnes. Indirect free kick taken by Kasper Schmeichel.45:38
The ball is sent over by Andrew Crofts. Anthony Knockaert challenges Craig Mackail-Smith unfairly and gives away a free kick. Direct free kick taken by Liam Bridcutt.45:01
The referee gets the second half started.45:00 +1:19 Half time
Half Time The half-time whistle blows.44:09
Centre by Will Buckley, clearance made by Zak Whitbread.43:36
Free kick awarded for an unfair challenge on Liam Bridcutt by Lloyd Dyer. Adam El-Abd takes the direct free kick.42:13
Shot from just outside the area by Will Buckley misses to the left of the target.41:17
Free kick awarded for a foul by Danny Drinkwater on Will Buckley. Liam Bridcutt takes the direct free kick.40:22
Craig Mackail-Smith takes a shot. Comfortable save by Kasper Schmeichel.39:00
The ball is crossed by Liam Bridcutt.38:15
Will Buckley sends in a cross, Paul Konchesky gets a block in. Liam Bridcutt decides to take the corner short.37:32
A cross is delivered by Andrew Crofts.35:57
A cross is delivered by Wayne Bridge, save made by Kasper Schmeichel.35:03
Andrew Crofts gives away a free kick for an unfair challenge on Anthony Knockaert. Danny Drinkwater takes the direct free kick.33:59
Foul by Paul Konchesky on Will Buckley, free kick awarded. Free kick crossed right-footed by Liam Bridcutt, save by Kasper Schmeichel.33:05
The ball is delivered by Ashley Barnes, Ritchie De Laet gets a block in. Centre by Wayne Bridge, clearance by Wes Morgan.30:08
A cross is delivered by Ashley Barnes. The official flags Craig Mackail-Smith offside. Indirect free kick taken by Kasper Schmeichel.26:08
Anthony Knockaert takes a shot. Save made by Tomasz Kuszczak.23:16
Free kick awarded for a foul by Wes Morgan on Craig Mackail-Smith. Free kick taken by Liam Bridcutt.22:19
A cross is delivered by Anthony Knockaert, Adam El-Abd makes a clearance. Free kick awarded for an unfair challenge on Gordon Greer by David Nugent. Gordon Greer takes the free kick.19:23
Lloyd Dyer produces a cross.17:23
Ritchie De Laet gives away a free kick for an unfair challenge on Ashley Barnes. The free kick is swung in right-footed by Liam Bridcutt, Kasper Schmeichel makes a save. Corner taken by Liam Bridcutt from the right by-line played to the near post, Header on goal by Ashley Barnes from inside the box goes harmlessly over the target.16:03
Martyn Waghorn fouled by Adam El-Abd, the ref awards a free kick. Kasper Schmeichel restarts play with the free kick.15:35
Liam Bridcutt takes a short corner.14:00
Free kick awarded for a foul by Anthony Knockaert on Wayne Bridge. Wayne Bridge takes the direct free kick.13:02
Close range shot by Martyn Waghorn goes over the bar.9:58 Goal scored
Goal! - Andy King - Leicester 1 - 0 Brighton A goal is scored by Andy King from inside the area high into the middle of the goal. Leicester 1-0 Brighton.9:50
Andy King takes a shot. Blocked by Gordon Greer.8:32
Lloyd Dyer takes a shot. Adam El-Abd gets a block in. Anthony Knockaert takes a inswinging corner from the right by-line played to the near post.7:53
Short corner taken by Danny Drinkwater from the left by-line.7:22
Corner taken by Anthony Knockaert from the right by-line, save by Tomasz Kuszczak.5:14
Anthony Knockaert fouled by Andrew Crofts, the ref awards a free kick. Martyn Waghorn produces a strike on goal direct from the free kick, Tomasz Kuszczak makes a save. Anthony Knockaert takes a short corner. Danny Drinkwater takes a shot. Gordon Greer gets a block in.4:20
Gary Dicker challenges Ritchie De Laet unfairly and gives away a free kick. Direct free kick taken by Wes Morgan.1:32
Will Buckley produces a cross, blocked by Paul Konchesky. Corner taken right-footed by Liam Bridcutt.0:54
Unfair challenge on Liam Bridcutt by Danny Drinkwater results in a free kick. Direct free kick taken by Liam Bridcutt.0:00
The referee gets the game underway.
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