The invention relates to a recombinant human cytomegalovirus (CMV) protein dimeric complex, comprising CMV gH protein or a complex-forming fragment thereof, and CMV UL116 or a complex-forming fragment thereof. Also provided herein are nucleic acids encoding said gH/UL116 dimeric complex, host cells for recombinant expression of said gH/UL116 dimeric complex, and the use of said gH/UL116 dimeric complex for use as a vaccine antigen.