Using observations at the 21-cm wavelength obtained with the Lowell Telescope, a weak H I emission feature at a velocity + 100 km/s LSR and of column density log N(H I) = 18.5 ± 0.2 toward the star 4 Lac is detected. The feature corresponds in velocity with a high-velocity gas component which was observed in several UV resonance lines in the IUE spectra of this star. The component gas temperature and the line-of-sight column density are estimated.