The crystal and magnetic structures of UCu 1 . 3 Sn 2 and UNi 1 . 4 Sn 2 have been investigated by powder neutron diffraction. The results indicated for both compounds an antiferromagnetic ordering of the AFI type with the uranium magnetic moments aligned along the tetragonal c-axis. At 2 K the ordered magnetic moment amounts to 2.32(7) μ B and 1.89(8) μ B for UCu 1 . 3 Sn 2 and UNi 1 . 4 Sn 2 , respectively.