A retrofit body for a rotor blade (2) of a wind power plant has a retrofit body tip (11) and a coupling side (12) arranged away from the retrofit body tip (11) and adapted for molding the retrofit body (7) to the rotor blade tip (6), such that when the retrofit body (7) is molded onto the rotor blade tip (6), the retrofit body tip (11) protrudes from the rotor blade tip (6) by a predetermined span extension (16) in the spanwise direction of the rotor blade (2), the retrofit body (7) a profile lug (9) which forms the front of the retrofit body (7) seen in the direction of flow of the rotor blade (2) and which has the retrofit body leading edge (8) and away from the retrofit body tip (11) beyond the coupling side by a predetermined length protrudes with its leading edge extension portion (13), which, when the retrofit body (7) is integrally formed on the rotor blade tip (6) t, facing the rotor blade root (5) and covering an outer region of the rotor blade leading edge (3) seen in the spanwise direction, the profile nose (9) being parallel to the retrofit body leading edge (8) arranged a plurality of juxtaposed and protruding from the profile nose (9) Having projections (18) whose heights and / or their distances from each other and / or their offset away from the Nachrüstkörpervorderkante (8) in the flow direction are dimensioned such that the buoyancy-reducing effect of the projections (18) only at those Anstellwinkeln (24) of the retrofitted rotor blade (1) equal to or greater than a design pitch angle (24) of the original rotor blade (2).
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