A one piece wire shelf extension for expanding the depth of an existing wire shelf whose front face is defined by a front support wire and a spaced support wire, the wire shelf extension having support wires and, perpendicular thereto, stringer wires wherein at least two of the stringer wires have extended segments that bend at a 90° angle relative to the plane of the support and stringer wires said extended segments adapted to engage the front and spaced support wires.