Qualcomm said it would appeal a South Korean court decision on Wednesday to uphold a record $873 million fine against the U.S. chip giant for unfair business practices related to patent licensing and modem chip sales.

The ruling by the Seoul High Court is a setback for Qualcomm as it battles customers over royalties and antitrust violations around the world, including an ongoing case brought by the U.S. Federal Trade Commission.

Judge Noh Tae-ak rejected the company’s appeal against the penalty imposed by the Korea Fair Trade Commission (KFTC) in 2016, saying Qualcomm had abused its dominant market position.

The court also confirmed some remedies proposed by the KFTC, including an order for Qualcomm to stop discriminating against rivals who sought to use its essential mobile patent and develop competing modem chips to supply smartphone makers.

The court however dismissed the regulator’s claims that Qualcomm had disadvantaged smartphone makers by signing “comprehensive” licensing deals, opening the door for the company to continue taking a cut of the price of the phone as a licence fee.

“We disagree with the court’s decision to accept parts of the KFTC order and will immediately seek to appeal those provisions to the Korea Supreme Court,” Qualcomm Executive Vice President Don Rosenberg said in a statement.

Qualcomm said it was “gratified” the court had reversed the KFTC’s order to renegotiate the licensing terms.