Disclosed is an immunogenic composition for use in vaccination of a subject against serogroup X meningococcus, wherein the composition comprises a meninigococcoal fHbp antigen and an aluminium salt adjuvant, and optionally NHBA and/or NadA antigens. The composition is either free from meningococcal outer membrane vesicles, or includes said vesicles and the fHbp antigen is soluble.