Abstract: An internal combustion engine having at least one combustion chamber in which the chamber has at least two hydraulically or pneumatically actuatable valves that are each guided in a respective valve guide. The engine includes an inlet valve for admitting fuel or a fuel-air mixture into the combustion chamber before the combustion event and an outlet valve for exhausting the combustion exhaust gases from the combustion chamber after the combustion event. In such internal combustion engines, in order to shorten the response times of the valve control, the valves are fixed relative to the valve guide by means of a respective electrically actuatable fastening element.