The Department of Justice sued Uber on Wednesday, alleging the company charged wait-time fees to customers with physical disabilities.

The lawsuit, filed in the U.S. District Court for the Northern District of California, alleges the Uber violated Title III of the Americans with Disabilities Act, which prohibits discrimination by private transportation companies. In Uber’s case, that means charging customers with physical disabilities a fee if they needed more time to get into the vehicle.

The company’s stock dipped 4.7%.

Uber said in an emailed statement it disagrees with the DOJ that is policies violate the ADA.