Temporary contracts are increasingly used in academia. This is a major concern for non-tenured researchers, since weak job security may hamper job satisfaction. This paper presents an empirical analysis of the role of academic tenure for job satisfaction of researchers in European countries. The work uses data from the MORE2 survey, a large-scale representative survey of researchers in all European countries. The results show that, "ceteris paribus," academics with a permanent contract are on average more satisfied with their job than those that are employed on a temporary basis. We also show that academic tenure is a relatively more important factor of job satisfaction for researchers at an intermediate stage of the career. Finally, we point out some important differences in the working of the model among European countries.