  We consider a general class of asymptotically locally AdS_5 solutions of
minimal gauged supergravity, that are dual to superconformal field theories on
curved backgrounds S^1 x M_3 preserving two supercharges. We demonstrate that
standard holographic renormalization corresponds to a scheme that breaks
supersymmetry. We propose new boundary terms that restore supersymmetry, and
show that for smooth solutions with topology S^1 x R^4 the improved on-shell
action reproduces both the supersymmetric Casimir energy and the field theory
BPS relation between charges.
