  The two-loop electroweak bosonic correction to the muon lifetime and the
M_W-M_Z interdependece is computed using analytical methods of asymptotic
expansion. Combined with previous calculations this copmletes the full two-loop
correction to $\Delta r$ in the Standard Model. The shift to the prediction of
W-boson mass due to two-loop bosonic corrections does not exceed 1 MeV for the
range of the Higgs mass from 100 to 1000 GeV.
