Canelo Alvarez will not fight again this year.

The new WBO junior middleweight titleholder broke his right thumb in his victory over Liam Smith on Saturday at AT&T Stadium in Arlington, Texas, according to a press release from Golden Boy Promotions. Alvarez suffered what Dr. Pedro Jaime Lomeli said was an “avulsion fracture.”

The injury doesn’t require surgery and the prognosis is “excellent,” according to the release, but he won’t fight again until next year. The hand will be immobilized for the next six weeks.

Canelo had planned to fight in December if the injury wasn’t serious. He said his hand was injured in the second round of the fight.

He won the title by knocking out Smith with a left hook to the body in the ninth round. He implied strongly afterward that he would fight as a middleweight going forward.