Rory McIlroy was forced to use a backup driver in the PGA Championship when his regular driver was tested and deemed to be nonconforming after he arrived at Quail Hollow, according to a report on SiriusXM PGA Tour Radio on Friday.

Rory McIlroy had to switch drivers at the PGA Championship after his gamer was deemed non-conforming, according to a report by PGA Tour radio’s Jason Sobel. McIlroy is known as the best driver of the golf ball of his generation.

The Masters champion had his regular driver deemed non-conforming Tuesday and had to put a backup in play at Quail Hollow.