Charlton 0-2 Preston
Danny Mayor scored one and created another as Preston deservedly beat Charlton in the Carling Cup.
Darel Russell opened the scoring, driving in the rebound from 12 yards after Mayor's shot was blocked.
Teenage winger Mayor's low shot from 25 yards sealed the win for North End, who will travel to Southampton in the third round.
Charlton, who made 11 changes, had a Jason Euell effort ruled out for offside in stoppage time.