Given the key role that entrepreneurs play in a country’s economic growth, there is a need to study how entrepreneurs innovate for their firm’s survival. This study aims to investigate the mediating effect of proactive personality on the relationship between core self-evaluations (CSE) and innovative behaviors among microentrepreneurs. Data was obtained from a survey administered to 307 micro entrepreneurs in Jakarta, Indonesia and its surrounding cities. Data was tested using Hayes’ PROCESS macro on SPSS. Results showed that proactive personality mediated the relationship between CSE and innovative behavior, whereby CSE leads to proactive personality, which in turn influences innovative behavior. Theoretical and practical implications of the findings are further discussed