In calculating sea surface temperatures from thermal infrared data from satellites in an area of sunglint it is necessary to apply a correction to allow for reflected solar infrared radiation. A method for making this correction is proposed and it is based on using the well-known theory of Cox and Munk for thermal infrared wavelengths as well as for visible wavelengths. A simple formula enables the correction to be calculated on a pixel-by-pixel basis throughout the area of sunglint.