Teamsters union members working at Costco Wholesale locations across the country voted to authorize a strike on Sunday, with more than 85% of members in favor of hitting the picket lines. The union represents more than 18,000 Costco employees nationally.

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.

Costco workers affiliated with the Teamsters have voted in favor of going on strike if no deal is made ahead of a January 31 contract deadline.