  We show that the radiative corrections containing terms up to order $\alpha q
/ \pi M_1$ for unpolarized semileptonic decays of baryons with positron
emission can be obtained by simply reversing the sign of the axial-vector form
factors in the corresponding final expressions of such decays with electron
emission. This rule is valid regardless of the final kinematical variables
chosen and of the particular Lorentz frame in which the final results are
required.
