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We investigate the relation between the equivalent width of He ii emission lines and the monochromatic continuum luminosity at the line wavelength in the spectra of Wolf-Rayet stars. Model stellar atmospheres and spectra are used to show that the equivalent width inversely correlates with the monochromatic continuum luminosity. We nd the eect in Wolf-Rayet star models over a large range of stellar parameters. The eect is shown to be connected to density dierences among Wolf-Rayet star winds. The conclusion is drawn that the Baldwin eect may provide a new method for the determination of Wolf-Rayet star distances.

On the Baldwin effect of He ii emission lines in WR (WN) stars