An adjusting system for camshafts of an internal combustion engine having an emergency running function, comprising a phase shifter gearing with an input drive element driven by a crankshaft of an internal combustion engine, an output drive element which drives a camshaft of the internal combustion engine, and an actuating element, by means of which a relative rotation between the drive input element and the drive output element can be realized by means of a device for imparting a braking torque, which is variable for normal operation, to the actuating element. In the event of failure of the device and/or control thereof, an emergency running setting of the camshaft can be attained and maintained as a result of braking or respectively, arresting the actuating element.