  The Higgs-mass dependence of the Standard Model contributions to the
correlation between the gauge-boson masses is studied at the two-loop level.
Exact results are given for the Higgs-dependent two-loop corrections associated
with the fermions, i.e. no expansion in the top-quark and the Higgs-boson mass
is made. The results for the top quark are compared with results of an
expansion up to next-to-leading order in the top-quark mass. Agreement is found
within 30% of the two-loop result. The remaining theoretical uncertainties in
the Higgs-mass dependence of Delta r are discussed.
