Hypersentimentality to possessions has been proposed to play an important role in the development and maintenance of compulsive hoarding. The current study prospectively examined the formation of attachment to a newly acquired object in an OCD sample (n=62) to determine whether specific hoarding symptoms moderated the development of attachment to an object over time. Participants rated their level of attachment to a keychain immediately upon receipt (time 1) and one week later (time 2). We hypothesized that individuals with a tendency to hoard and strong beliefs about the value of possessions would exhibit greater attachment to the object over time. Hierarchical multiple regression analyses revealed that a person's initial attachment to the object was the best predictor of attachment one week later. Although emotional attachment increased similarly for all participants independent of their hoarding symptoms, specific hoarding-related beliefs and behaviors uniquely predicted initial attachment to the keychain.