Software reuse can lower costs and increase the quality of software development. Despite a large body of research focused on technical and organisational factors, there is still limited research on the software developers’ perspective regarding software component reuse. Therefore, this paper investigates the developers’ adoption intention to use existing software components. Information systems adoption research has extensively focused on the technological aspects and less on the individual factors. However, studying these individual differences is important, as research has shown that individuals do not always behave according to rational assumptions. This study analyses the adoption of software components based on the unified theory of acceptance and use of technology and extends the research model by integrating the not-invented-here bias and the concept of mindfulness to account for individual differences. An empirical study with 142 software developers was conducted to empirically validate the research model. The results show that performance expectancy, social influence and not-invented here bias play an important role in the developers’ decision to adopt software components. Furthermore, findings show that a mindfulness state has a negative influence on the not-invented-here bias and it directly affects the intention to adopt existing software components.