In recent paper Fakkousy et al. show that the 3D Hénon-Heiles system with Hamiltonian16 (and of course, when α = γ = 0, in which case the Hamiltonian is separable). It is known that the second case remains integrable for A, C, B arbitrary. Using Morales-Ramis theory, we prove that there are no other cases of integrability for this system.