A refrigerating appliance includes a cabinet including an outer wrapper defining opposing first and second sidewalls, a rear wall coupling the first and second sidewalls, and an inner liner. An insulating cavity that is under vacuum is defined between the outer wrapper and inner liner. A trim breaker forms a seal between the outer wrapper and the inner liner. A mullion extends across an access opening. A mullion bracket extends across the access opening where the mullion bracket includes first and second ends having engagement portions coupled with an exterior surface of the outer wrapper. A pair of recesses on the exterior surface of the outer wrapper provide corresponding gaps between the first and second ends of the mullion bracket and the first and second sidewalls, respectively.