Kelechi Iheanacho scored in the 94th minute to help Leicester defeat Brighton in the FA Cup on Wednesday.
The Foxes, who have never won the tournament, will now take part in the quarter-finals.
The first-half saw both sides start sluggishly with neither managing a shot on target.
Andi Zeqiri and Cengiz Under both had efforts ruled out for offside in the second-half.
The game looked destined for extra-time until Iheanacho made his statement.
After a quick corner, Youri Tielemans' cross found the Nigerian free at the back post to head home the winning goal, his fifth of the season.