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

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.

The Epic Games Store will return to the Google Play Store after winning a legal battle, which lasted over four years.