  We determine the conditions for maximally supersymmetric AdS_5 vacua of
five-dimensional gauged N=2 supergravity coupled to vector-, tensor- and
hypermultiplets charged under an arbitrary gauge group. In particular, we show
that the unbroken gauge group of the AdS_5 vacua has to contain an
U(1)_R-factor. Moreover we prove that the scalar deformations which preserve
all supercharges form a Kahler submanifold of the ambient quaternionic Kahler
manifold spanned by the scalars in the hypermultiplets.
