More than a decade after the U.S. Supreme Court affirmed his right to use a golf cart while competing, a famed golfer with a disability is again fighting for accommodations on the links.

Casey Martin was born with Klippel-Trenaunay-Weber syndrome in his leg, a condition that makes walking difficult for him. In a 2001 ruling, the Supreme Court determined that the Americans with Disabilities Act afforded Martin the right to use a golf cart while competing on the PGA Tour.

This week, however, Martin again found himself denied a ride. Now a coach at the University of Oregon, Martin was told that he could not use a cart at a U.S. Junior Amateur event in California on Monday due to U.S. Golf Association rules.

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“I’ve never felt more discriminated against or unfairly taken advantage of in my entire life,” Martin told Golfweek.

Officials from the U.S. Golf Association say they’ve since apologized to Martin and called the incident a “misunderstanding.”

“We regret that this misunderstanding may have caused Casey an inconvenience, but it certainly was unintentional,” the organization said in a statement.