A review of Einstein’s derivation of the Lorentz transformation (LT) discloses an unjustified assumption that leads to conflicts with experimental data. By taking advantage of a normalization condition, it is shown that a different version of the relativistic space-time transformation is obtained which allows the theory to be consistent with the ancient principle of objectivity of measurement while still satisfying Einstein’s original postulates regarding the constancy of the speed of light and the equivalence of all inertial systems.