In 2003, the riding was expanded. Initially, the district would consist of the area of Oshawa south of Rossland Road as well as the area east of Ritson Road south of Taunton Road. However, area MP Judy Longfield objected, by which point the proposed boundaries had changed to south of Rossland and south of Taunton west of Ritson. Longfield proposed, citing support from MP Ivan Grose and Oshawa City Council, that the district be changed from the previous version to not include the area west of Simcoe Street north of Rossland Road and the Oshawa Creek north of former Highway 2, but include the area east of Sincoe Street up to Winchester Road. A new Whitby—Oshawa riding would cover the rest of Oshawa. This proposal ended up being implemented. The redistributed result showed minimal change.