Stopping powers of Au for protons from 3 to 8 MeV have been measured with a surface barrier silicon detector. The results have been presented in the form of Bichsel's X-variable. The experimental X-value points fit very well with the theoretical X-value curve using the Bonderup shell correction and the mean excitation energy, I, of 745.4 eV. If we use Bichsel's shell correction, I-value of 824 eV reproduces fairly well the experimental X-value points. In the range from 3 to 8 MeV, it is difficult to determine which shell correction represents the experimental situation better. However, if we experiment in the range from 8 to 20 MeV, it may be possible to judge which shell correction better represents the experimental points.