A U.S. appeals court upheld a major antitrust ruling against Google, siding with Epic Games and ordering sweeping Play Store reforms to boost app market competition.

Alphabet’s Google on Thursday failed to persuade a U.S. appeals panel to overturn a jury verdict and federal court order requiring the technology company to revamp its app store Play. The San Francisco-based 9th U.

A federal appeals court has upheld a jury verdict condemning Google’s Android app store as an illegal monopoly, clearing the way for a judge to enforce a potentially disruptive shakeup.