MACUNGIE — Mack Truck workers in Pennsylvania and two other states have ratified a four-year collective bargaining agreement reached after a 12-day walkout last month.

The United Auto Workers Local 677 said more than 79 percent of members voted Sunday in favor of the pact, which covers about 3,500 workers at plants in Macungie and Middletown, Pa., as well as Hagerstown and Baltimore, Md., and Jacksonville, Fla.

Union secretary-treasurer Ray Curry said the pact includes “significant wage increases, job security protections, and held the line on health care costs.”

Members in the three states walked out just before midnight Oct. 12. A tentative agreement was reached Oct. 24.