A flame ionization detector has a combustion chamber with an electrode arrangement for measuring an electric current from a gas flame to an electrode of the electrode arrangement, a burner nozzle having at least one output-side outlet for ejecting a gas mixture to be ignited between the electrode arrangement and having at least one input-side inlet for feeding a hydrogen-containing combustible gas and a carbon-containing gaseous analyte through a transport channel to the outlet, and a feeder for feeding oxygen-containing combustion air into the combustion chamber, wherein at least one cut-out is provided in the burner nozzle, through which cut-out combustion air can pass from the combustion chamber into the gas mixture flowing out of the outlet.