(Bloomberg) -- Uber Technologies Inc. beat back an aggressive bid to force it to treat California drivers as employees, but a judge’s ruling may allow a long-running fight over pay and benefits to gain traction in 2020.U.S. District Judge Edward Chen declined Monday to order Uber to instantly convert drivers in its home state from contractors to employees based on an argument that it’s cheating not just workers but also the public at large.But the San Francisco judge also refused to throw out the case, an early test of a California law aimed at gig economy companies that’s set to take effect Jan. 1. In what may turn out to be a significant threat to Uber’s business model, Chen concluded the case presents “a plausible claim that any misclassification by Uber is willful.” Uber declined to comment on the ruling.

AB 5, signed by California Governor Gavin Newsom in September, says workers can generally only be considered contractors if they perform duties outside the usual course of a company’s business. Legal experts say the law weakens Uber’s argument that its drivers are independent contractors, and even the company acknowledges the law creates a higher hurdle.

Read More: Uber’s Arch Nemesis on Driver Pay Sues Before New Law Even InkedShannon Liss-Riordan, the lawyer representing the drivers and a longtime Uber nemesis, argued AB 5 was passed in order to stop Uber and the rest of the gig economy from misclassifying its workers. Liss-Riordan said in an email that she’ll refile the complaint, and looks forward to “proceeding with the case and at last requiring Uber to comply with California law.”

Chen said it’s premature to order Uber to immediately reclassify its California drivers given that arbitration agreements they signed barring them from pursuing their grievances in court will likely diminish the number who would benefit, which the judge said is still “ill-defined.”But he refused Uber’s request to dismiss the complaint, finding the driver who filed it “could form the basis” of a lawsuit based on the 2018 Dynamex decision by California’s highest court. The ruling applies a more straight-forward test to determine which workers qualify for employee status and the attendant benefits.Legal experts widely agree that test, especially as codified by AB 5, will make it much harder for Uber to continue to deny California drivers benefits including business expense reimbursements that would ordinarily be available to employees.The case is Colopy v. Uber Technologies Inc., 19-cv-06462, U.S. District Court, Northern District of California (San Francisco).