The fine-tuning principles are exploited to predict the top-quark and Higgs-boson masses. A modification of the Veltman condition based on the compensation of vacuum energies within the Standard Model is proposed. It is supplemented with the requirement of stability under rescaling and of finiteness of the e⁺e^-H-vertex. The top-quark and Higgs-boson couplings are fitted for the ultraviolet scale Λ ≈ 10¹⁵ GeV. It yields the low-energy values m_t = 175 ± 5 GeV, m_H = 210 ± 10 GeV.