Proactive security behavior (PSB) is important in strengthening the information security posture of organizations. We draw upon the proactive motivation literature to identify the motivational factors that may underlie PSB. On that basis, we develop a preliminary research model comprising three hypotheses which pose that felt responsibility for constructive change (FRCC), role-breadth self-efficacy (RBSE), and positive affect (PA) positively influence PSB. We conduct a survey of US-based employees and test our model. Our results show that FRCC and RBSE are significant drivers of PSB, and that FRCC is more robust to any control effects. In future research steps, we plan to examine whether user participation in information security policy design and other related activities enhances FRCC. We plan to do so by conducting an experiment.