Mike Tyson’s fight with Jake Paul has been postponed after the 57-year-old Tyson fell ill on a flight last weekend.

Tyson and Paul said Friday that they will announce a new fight date next week. They were scheduled to meet July 20 in Arlington, Texas.

Tyson fell ill on a flight from Miami to Los Angeles last Sunday, and his flight was met by first responders. Tyson’s camp attributed the episode to an ulcer problem.

Tyson hasn’t fought professionally since June 2005, but he has been training regularly for several years. The 27-year-old Paul is a YouTube star who has forged a successful prizefighting career mostly by taking on mixed martial artists and journeymen boxers.