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.

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

Alphabet Inc.’s Google lost its appeal of a judge’s order requiring an overhaul of the technology giant’s app store policies in an antitrust case filed by Fortnite-maker Epic Games Inc.The ruling by the 9th US Circuit Court of Appeals on Thursday means the Google Play store will need to lift restrictions that prevent app developers from setting up rival marketplaces and billing systems.