Brian Ortega is changing weight classes for his next battle.

The 34-tear-old Mexican American American professional mixed martial artist, a former Resurrection Fighting Alliance featherweight champion who now fights for UFC, will now fight Aljamain Sterling in a different weight class at this weekend’s UFC Fight Night on Saturday in Shanghai.

Originally scheduled to in the featherweight division, Ortega (16-4) and Sterling (24-5) will now fight at the 155-pound  catchweight limit, after both fighters weighed in at 153 pounds on Friday.

The UFC did not provide a reason for the switch, although it’s well known that Ortega struggles to make the featherweight limit of 145 pounds and has been contemplating a permanent move up.

The nontitle contest is scheduled for five rounds in the co-main event of UFC Fight Night at Mercedes-Benz Arena.

Sterling is a former 135-pound champion who moved to featherweight after his title loss to Sean O’Malley in August 2019. The 36-year-old is working his way to a second UFC belt and is 1-1 in his new weight class. The loss came against No. 1-ranked contender Movsar Evloev in December.

Ortega is 1-3 in his past four appearances, although two of the losses came against undisputed or interim champions in Alexander Volkanovski and Yair Rodriguez.