Harris English may be without caddie Eric Larson for next week's Open Championship at Royal Portrush after he was denied entry to the UK.

Harris English is in Scotland to play in the Genesis Scottish Open. His longtime caddie Eric Larson is not. According to a report by the Associated Press, Larson was denied entry because of a drug conviction 30 years ago when he pleaded guilty to sending cocaine to friends.

Larson said he didn’t realize he needed the ETA visa until the U.S. Open, and when he filled out the form he was denied. Grounds for refusal include an applicant who has been convicted of a criminal offense in the U.K. or overseas for which they served 12 months or more in prison.