Teamsters said on Sunday its members at U.S. retailer Costco Wholesale voted in favor of a nationwide strike, as they entered a final round of talks to reach a new contract ahead of a Jan. 31 deadline.

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.