Neutron diffraction measurements performed on polycrystalline samples of TbNiGe 2 and HoNi 0.64Ge 2 show that both exhibit at 4.2 K uniaxial antiferromagnetic ordering with G-mode. The magnetic moments of Tb and Ho are oriented parallel to the c-axis of a CeNiSi 2 type structure and at 4.2 K are 8.8μ B and 6.4μ B respectively.