The Scotland international has been in great form recently.
The first fixture between the two teams finished 0-0 at Valley Parade and Bradford were never in the game at the Madejski Stadium.
Early goals from Hal Robson-Kanu and Gareth McCleary saw them on their way and when Filipe Morais saw red the tie was seemingly over.
But there was still time for one of their best players on the night to find the back of the net.
Mackie, who joined Forest from QPR in 2013, is currently on a season long loan deal agreed in August, after Stuart Pearce decided he was not in his plans for the upcoming season.
He is in great form. The strike was the Forest owned player's fifth goal in six games and his recent form saw him win the player of the month award at the Berkshire club in February.
His great form for Reading has certainly not gone unnoticed by fans at the City Ground. Here is some of the reaction from Nottingham Forest fans to his performance this evening:
I like Mackie. Don't really care what anyone else thinks tbh #nffc— Claire (@LilMissRedDog) March 16, 2015
Defo need to give Mackie a chance next season DF might get the best outta him that he's showing at Reading #nffc— Michael Cleaver (@xCleaverNFFC) March 16, 2015
Mackie work rate unreal— GM -! (@Glen_NFFC) March 16, 2015
Still maintain it was a poor decision from #nffc to allow Jamie Mackie out on loan for the season. Like him.— Baz Cooper (@bazdjcooper) March 16, 2015
Still to this day can't understand why we've loaned Jamie Mackie out this season #nffc— Adam Peberday (@adampeberday) March 16, 2015