  High temperature crystal structure of UPt$_2$Si$_2$ determined using
single-crystal neutron diffraction at 400 K is reported. It is found that the
crystal structure remains of the primitive tetragonal CaBe$_2$Ge$_2$ type with
the space group P4/$n m m. Anisotropic displacement factors of the Pt atoms at
the 2a (3/4 1/4 0) and Si atoms at the 2c (1/4 1/4 z) Wyckoff sites are found
to be anomalously large.
