A lawyer with loose lips has paid a big fine in the U.K.

Chris Gossage let it slip that renowned author J.K. Rowling was the secret thriller-writer who had crafted a book published last year.

Gossage was fined $1,645 for breaching client confidentiality rules.

His London law firm – Russells Solicitors – represents Rowling. They apologized and paid damages to Rowling.

It all began when the lawyer told a friend of his wife that the “Harry Potter” creator was also the author of “The Cuckoo’s Calling,” which was published last year under the name Robert Galbraith. The friend tweeted the information and it was followed up by the Sunday Times of london.

Gossage was also given a written rubuke by the Solicitors Regulation Authority for disclosing confidential information about a client to a third party.

The ruling was dated November 26th but it was published this week.

Sales of the thriller soared after Rowling was named as it’s author.