Big and potentially bad news for fans attending Bonnaroo this weekend. Mumford & Sons have canceled their set at the last minute and Jack Johnson is slated to replace them.

Johnson will replace Mumford & Sons Saturday night set.

As Consequence of Sound reports, Bonnaroo got lucky as Johnson was already slated to be a guest performer to ALO, a band on Johnson’s label.

Sadly, Mumford & Sons had to cancel their set as the bassist, Ted Dwane, is still recovering from brain surgery.

Bonnaroo made the announcement official via their website and via their Twitter.

(1/2) We were informed yesterday that Mumford & Sons have to cancel their #Bonnaroo appearance due to bassist Ted Dwane’s medical condition

— Bonnaroo (@Bonnaroo) June 14, 2013

(2/2) @JackJohnson will now headline Saturday night in Mumford & Sons' place | More info: http://t.co/C5Au23O2Fi #bonnaroo

— Bonnaroo (@Bonnaroo) June 14, 2013

The festival also included a statement from Johnson regarding suddenly becoming a headliner at the festival,

I was on my way to Bonnaroo to sit in on a set with my friends ALO last night when we got the call asking if I could possibly help out and cover for Mumford and Sons. I heard the news about Ted Dwane and was happy to know that he was on his way to recovery.  I called my band and asked if they were up for it.  Long story short – they are headed this way.  I’ve got a lot of lyrics and chords to relearn by Saturday night.  I was here to play the first Bonnaroo and it is a very special festival to my band. We are excited to hit the stage again. Get well Ted!

Aloha,

Jack

Consequently, it’s actually perfect timing for Johnson to be a headliner as he has an album coming out this Fall.

No word yet on if Bonnaroo plans to have Mumford & Sons back to headline in the near future.