Organisers of the Glastonbury Festival are warning fans not to buy tickets from an unauthorised website.
They say they have contacted Trading Standards over the site which is claiming to sell tickets for next year's festival.
According to the official festival site tickets for next year's event have not gone on sale yet.
Michael Eavis told the official site: "This company has absolutely no authority to sell these tickets. A licence has not yet been agreed with Mendip District Council, and companies like this can only harm the Festival's interests."
"As this site has no tickets there is no possibility that money you would pay over - which seems to include an exorbitant mark up - would go to the good causes that the Glastonbury Festival supports."
Organisers have applied for a licence to hold the event in the last weekend of June.
No decisions about the tickets will be made until the licence is granted, but they are expected to go on sale around March.