Jaminet continued in ADAC GT Masters in 2018 ADAC GT Masters, this time driving for Precote Herberth Motorsport. He and teammate Robert Renauer won the championship, resulting in Jaminet earning more international race outings and a place on the North American Porsche GT Team to drive endurance races in the WeatherTech SportsCar Championship, as well as a chance to drive the 2019 24 Hours of Le Mans.