The wings of the D.I used an orthodox structure for the time, composed of spruce spars and leading edges. Steel tubing was used for the compression members while wires were used for internal bracing. A wire-based trailing edge gave the wing a distinctive scalloped appearance. The single-piece upper wing was fixed to the fuselage using the "W"-shaped struts, while the lower wing was bolted directly onto the side of the lower fuselage. Unblanced ailerons were only fitted onto the upper wing; these were hinged onto false spars set within the framework of the wing and actuated via a projecting lever set into the wing itself. During its later service, the wings had to undergo strengthening in order to support the use of more powerful engines that were adopted during the type's production run.