  In-medium modifications of light cluster properties in warm stellar matter
are studied within the relativistic mean-field approximation. In-medium effects
are included by introducing an explicit binding energy shift analytically
calculated in the Thomas-Fermi approximation, supplemented with a
phenomenological modification of the cluster couplings to the $\sigma$ meson. A
linear dependence on the $\sigma$ meson is assumed for the cluster mass, and
the associated coupling constant is fixed imposing that the virial limit at low
density is recovered. The resulting cluster abundances come out to be in
reasonable agreement with constraints at higher density coming from heavy ion
collision data. Some comparisons with microscopic calculations are also shown.
