An internal combustion engine having a valve train that includes a switchable cam follower is provided. The cam follower (20) has a generally cylindrical shape and can move longitudinally in a receptacle (21) of the engine (22), and is acted upon at one axial end by a cam (23) of a camshaft and at the other axial end indirectly or directly by a gas exchange valve of the valve train. A main oil gallery (24) is arranged in the internal combustion engine (22) for introducing hydraulic medium to a valve lash adjustment element arranged in the cam follower (20). A switchable oil channel (25) is arranged in the internal combustion engine (22) for introducing hydraulic medium into a region of a switch element arranged in the cam follower (20), wherein, the outer surface of the cam follower (20) has a helical groove (26), through which at a peripheral point of the cam follower (20) the switchable oil channel (25) is connected hydraulically to the region of the switch element which opens at another peripheral point of the cam follower (20).