  We investigate possible finite-volume effects on baryon number
susceptibilities of strongly interacting matter. Assuming that a hadronic and a
deconfined phase both contribute to the thermodynamic state of a finite system
due to fluctuations, it is found that the resulting shapes of the net-baryon
number distributions deviate significantly from the infinite volume limit for a
given temperature $T$ and baryochemical potential $\mu_B$. In particular, the
constraint on color-singletness for the finite quark-gluon phase contribution
leads to a change of the temperature dependence of the susceptibilities in
finite volumes. According to the model, the finite-volume effect depends
qualitatively on the value of $\mu_B$.
