As Costco finds itself embroiled in a public battle over its controversial DEI policies, a much larger fight is looming with 18,000 store employees set to head to the picket lines if the grocery chain can’t agree to a new contract by Friday.

More than 18,000 Costco workers will be walking picket lines in less than two weeks if a labor dispute over wages and benefits is not resolved, according to the Teamsters union. Members voted by an 85% margin to authorize a strike when their current contract expires on Jan. 31, the union announced on Sunday.

The unionized Costco workers are on a contract that expires Jan. 31, according to their Teamsters representatives.