Combining proactive literature, the social learning/cognitive theory, and cross-cultural adjustment literature, we examined the sojourners' experience from a positive perspective. Using a three-wave prospective design and a sample of 135 international students, we found that proactive personality was positively related to adjustment self-efficacy, which in turn positively related to academic and social adjustment. Meanwhile, adjustment self-efficacy mediated the link between proactive personality and adjustment. Implications, limitations, and future research are discussed.