A federal appeals court has upheld a U.S. judge’s ruling in Nevada requiring Station Casinos’ Red Rock Casino to bargain with the culinary and bartenders unions.

The ruling by a three-judge panel of the 9th U.S. Circuit Court of Appeals is a victory for the union in a yearslong fight to unionize about 1,350 employees at the Las Vegas-based casino company it accuses of refusing to negotiate in good faith.

Union leaders accused Red Rock of undercutting a December 2019 union election by enhancing health benefits and retirement accounts just days before the vote.