A motor head cover for a roller shade that has an electric motor releasably secured to an end bracket by an insert plate. The motor head cover has a C-shaped body having a mouth opening and an outer circumferential surface. The outer circumferential surface has an inner body surface, an outer body surface, an outer, inwardly directed, side surface, and an inner, inwardly directed, side surface. Each of the side surfaces extend inwardly from the circumferential surface at approximately 90 degrees to collectively form a raceway with the inner body surface. The inner, inwardly directed, side surface is configured to be engaged about a circumferential lip on the insert plate to assist in releasably securing the motor head cover thereto. The inner, inwardly directed side surface, has a series of spaced apart notches that assist in a non-destructive flexure of the motor head cover when securing about the insert plate.