We show that superheavy threshold corrections in the New Minimal Supersymmetric GUT based on the SO(10) Higgs system ${bf{210oplus 126oplus {bar {126}}oplus 10 oplus 120}} $ can comfortably correct the prediction for the value of $alpha_3(M_Z)$ from
the relatively large value predicted by the two loop RG equations to the central value determined by the current world average. The unification scale is raised above the one loop value over almost all of the viable parameter space.
