A restraint system is provided for a mobile machine (1), in particular an industrial truck, with a driver's seat (2) and a safety belt (3). The restraint system has a variable-length mechanical connection (6) between a front part (4) of the roof that covers the driver's seat or the driver's cab and the safety belt (3). The variable-length mechanical connection (6) makes it easier for the operator to attach the safety belt (3). The operator will also attach the safety belt (3) because otherwise it will be difficult or impossible to use the control elements (5). The variable-length mechanical connection (6) simultaneously prevents bypassing of a device to detect whether the safety belt (3) is closed.