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.

Appeals court upheld the ruling from the original Epic v. Google lawsuit. Now Google must allow third-party stores on its app store.