  The electroweak $\mathcal O(\alpha)$ radiative corrections to the decay of
the heavy CP-even MSSM Higgs boson to weak gauge bosons are presented. Due to
the suppression of the tree-level $H^0WW/H^0ZZ$ coupling, the electroweak
contributions to the partial decay width are significant. Although the
effective Born decay width can be rather small for certain $M_{A^0}$ values
(especially for large $\tan\beta$), the corrected partial widths at different
values of $M_{A^0}$ are of comparable size.
