During the 2012 redistribution, the riding was originally going to be split into 2 ridings. South of former Highway 2, it would be part of a new riding called "Oshawa—Bowmanville" and the part north of former Highway 2 would be part of the riding of "Oshawa—Durham." During the public hearings, there was opposition to the new boundaries and the commission ended up revising the boundaries to consist of the area of Oshawa south of Taunton Road, despite the fact that the population of the district was now almost 20% above the provincial quota. MPs Erin O'Toole and Colin Carrie later objected, requesting that as much of Oshawa as possible be kept within one electoral district, adding 2 campuses. The commission rejected this.