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Yann Kermorgant scored twice as Charlton beat Oxford 3-0 in an FA Cup third-round replay on Tuesday night.
It was Kermorgant's late effort at the Valley last week that secured a replay as Charlton battled back from 2-0 down against the League 2 club.
He opened the scoring at the Kassam Stadium on 35 minutes with a 20-yard drive from Simon Church's pass.
Addicks scored again three minutes later when Church pounced on a slip by Michael Raynes and squared for Danny Green.
Kermorgant clinched Charlton's progress with a superb 25-yard free-kick into the top corner after 58 minutes.
Chris Powell's side travel to Championship rivals Huddersfield in the fourth round.