MOUNT OLIVE, Ill. (KSDK) – The last piece of a tentative agreement to end a teachers strike for an area school district has been put in place.

The Mount Olive Board of Education approved a contract agreement Wednesday night, which was reached between it and the teachers union Saturday. The union approved the agreement Sunday, and teachers and students returned to the classroom Monday.

Teachers hit the picket line for a week before an agreement was reached by both sides.

With the agreement, four teachers will have their retirement incentives reinstated, and the incentives will end following a January 15 deadline.

The agreement also eliminates a two-tier salary system, which would have meant new teachers would make less money than current teachers in the district, as well as the first pay raise since 2009.

According to teachers, the deal also includes making up three of the five school days they missed because of the strike.