Abstract: A gearshift device for the change-speed gearbox in a motor vehicle comprises a shift fork with a radially projecting selector arm having a selector groove provided therein. A selector shaft carries a radially projecting selector finger. The selector shaft is pivotable to align the selector finger to the selector arm of the shift fork. The selector finger is axially slidable to move the shift fork. A housing is arranged about the selector shaft A shifting guide is fixed to the housing. A pair of blocking teeth are provided on the shifting guide. The teeth are mutually arranged adjacent the selector arm to prevent axial movement of the selector finger when the finger is not radially aligned between the teeth.