Editor's note: The former contract between Masonite Architectural and its employees ended March 31. An incorrect date was included in an earlier version of this article.

MARSHFIELD - Masonite Architectural employees ended their strike Saturday evening after the union accepted a new agreement with the company.

The strike that involved around 350 workers began around 10:45 p.m. Tuesday after the company asked employees to work an additional six hours of overtime on Saturdays.

In the old contract that ended March 31, employees were required to work two Saturdays a month, according to Luke Kramer, business representative for the North Central States Regional Council of Carpenters, the union representing Masonite workers.

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Joanne Karimi, director of human resources for the architectural division of Masonite Corporation, said Thursday the overtime was not automatic and the primary reason the company added the possible six hours per month of overtime was to meet any needed customer demand.

The new contract does include additional overtime each month, Kramer said, but the amount of time the company has to post and cancel mandatory overtime changed. Employees now will work three mandatory Saturdays a month at six hours each. The company has to post any changes to that schedule 30 days in advance, Kramer said.

The company's workers in Marshfield had not been on strike in nearly 50 years.

The union voted to accept a new collective bargaining agreement at 4 p.m. Saturday and employees will return to work Monday.

"While negotiations were long and difficult for both sides, we are happy that we were able to reach an agreement satisfactory to our members and the employer," the union said in a news release.

Reporter Megan Stringer contributed to this report.

Contact Benita Mathew at (920) 309-3428 or bmathew@gannett.com. Follow her on Twitter at @benita_mathew.