Westbrook’s partially indexed chromium radiation X-ray diffraction pattern for Cr7C3 has been corrected as needed and completely indexed. The pattern corresponds to the orthorhombic modification of Cr7C3. The lattice parameters obtained (a = 7.019 +/- 0.010 Angstrom, b = 12.158 +/- 0.017 Angstrom, c = 4.526 +/- 0.008 Angstrom) are in good agreement with the presently accepted values for this phase.