Nigerians seeking to travel to the United States on non-immigrant visas will now receive single-entry three-month permits, the U.S. Embassy in Nigeria said, rolling back the up to five-year, multiple-entry visas they enjoyed previously.

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.