The present invention relates to the field of recombinant protein production and vaccine preparation. In particular, the invention provides means and methods for producing the pentameric gH/gL/UL128/UL130/UL131A complex of CMV. More specifically, the invention provides a pentameric gH/gL/UL128/UL130/UL131A complex of CMV produced in a baculovirus system which can be used as a vaccine against CMV.