The California Supreme Court ruled Thursday that app-based ride-hailing and delivery services like Uber and Lyft can continue treating their drivers as independent contractors rather than employees.

The unanimous decision by the state’s top court is a big win for tech giants. It also ends a yearslong legal battle between labor unions and tech companies over a law dictating the status of app-based service workers in the state.

The ruling upholds a voter-approved law passed in 2020 that said drivers for companies like Uber and Lyft are independent contractors and are not entitled to benefits like overtime pay, paid sick leave and unemployment insurance. Opponents said the law was illegal in part because it limited the state Legislature’s authority to change the law or pass laws about workers’ compensation programs.