An appliance includes a vacuum insulated structure that has a peripheral edge including a wrapper and a liner. A mullion is operably coupled to the vacuum insulated structure. A reinforcement assembly is operably coupled to the vacuum insulated structure and the mullion. The reinforcement assembly includes a perimeter frame that is operably coupled to the peripheral edge of the vacuum insulated structure, and a central plate that is operably coupled to the mullion. A door is operably coupled to the reinforcement assembly.