  In the context of the minimal supersymmetric extension of the Standard Model
the effect of a realistic wall profile is studied. It has been recently showed
that in the presence of light stops the electroweak scale phase transition can
be strong enough for baryogenesis. In the presence of non-trivial CP-violating
phases of left-handed mixing terms and Higgsino mass, the largest $n_B/s$ is
created when Higgsino and gaugino mass parameters are degenerate, $\mu = M_2$.
In the present paper we show that realistic wall profiles suppress the
generated baryon number of the universe, so that quite a stringent bound
$|\sin\phi_\mu | \gsim 0.2$ for $\mu$-phase $\phi_\mu$ can be inferred.
