  We present a consistent procedure for the calculation of the one-loop
corrections to the charginos and neutralinos by using their on-shell mass
matrices. The on-shell gaugino mass parameters M and M', and the Higgsino mass
parameter \mu are defined by the elements of these on-shell mass matrices. The
on-shell mass matrices are different by finite one-loop corrections from the
tree-level ones given in terms of the on-shell parameters. When the on-shell M
and \mu are determined by the chargino sector, the neutralino masses receive
corrections up to 4%. This must be taken into account in precision measurements
at future e^+ e^- linear colliders.
