Kansas City, Kan. ? Workers at the General Motors Fairfax plant in Kansas City, Kan., voted overwhelmingly to authorize a strike.

The vote on Thursday does not mean the workers will go on strike. It gives those bargaining for the union the authority to call for a strike if negotiations break down.

KSHB-TV reports that more than 90 percent of those who voted approved authorizing the strike. Workers said the main point of contention is the possible loss of seniority rights.

The vote was called after workers rejected a new local union contract. The plant has more than 4,000 workers.

Fairfax manufactures the Chevy Malibu, which was the company’s second-best selling car in the U.S. last year.