  We describe a stabilization mechanism for fuzzy $S^4_N$ in the Euclidean IIB
matrix model due to vacuum energy in the presence of a positive mass term. The
one-loop effective potential for the radius contains an attractive contribution
attributed to supergravity, while the mass term induces a repulsive
contribution for small radius due to SUSY breaking. This leads to a
stabilization of the radius. The mechanism should be pertinent to recent
results on the genesis of 3+1-dimensional space-time in the Minkowskian IIB
model.
