The Canadian Dj duo had been booked to perform the penultimate set on the John Peel Stage on Saturday (28Jun14), but they have since had to cancel the show.
Glastonbury bosses have now drafted in Scottish rockers Twin Atlantic to fill the gap - and the band can't believe its luck.
Singer Sam MCTrusty says, "It's been a dream of ours to play Glastonbury. It's the biggest and probably most famous festival in the world so it's genuinely an honour to be asked to play our songs and be a part of it all.
"Being there this weekend is a massive achievement for us and will feel very special on Saturday night... Hopefully you can join us for what will be a historic moment for our band."
Acts including Metallica, Kasabian, Arcade Fire, Dolly Parton, Jack White and Lily Allen are all due to perform at the festival from Friday (27Jun14).