Vallerand et al. developed a dualistic model of passion where two types of passion are proposed: harmonious and obsessive passion. They generally predict adaptive and less adaptive outcomes, respectively. In this study, we examine whether the type of passion that employees hold toward work influences their evaluations of job demands and resources. We hypothesized that a harmonious passion for work would lead to positive evaluations of job control and support in the workplace as well as to low levels of work overload. In contrast, we hypothesized that an obsessive passion for work would lead to evaluations of work overload and to low levels of job control and support. The results of a longitudinal study supported our hypothesis.