The present disclosure provides an immunogenic composition comprising: a) a hepatitis C virus (HCV) heterodimeric polypeptide that includes HCV E1 and E2 polypeptides; b) a T-cell epitope polypeptide comprising a T-cell epitope present in an HCV protein other than E1 and E2; and c) a pharmaceutically acceptable excipient. The present disclosure provides a method of inducing an immune response, in an individual, to an HCV polypeptide. The present disclosure provides an immunogenic composition comprising: a) a polypeptide that comprises one or more T-cell epitopes present in an HCV protein other than E1 and E2; and b) a pharmaceutically acceptable excipient.