Although wikis have gained considerable attention in higher education, students are often reluctant to use wikis in formal learning processes. Unlike company employees, students are not often rewarded for their participation in wiki-based assignments. Therefore, students seem to be opportunistic and decide to adopt wikis if they fit their current situation and preferences. This paper adapts the Decomposed Theory of Planned Behaviour to examine the situation in higher education classrooms. To better understand students’ decision to use wikis, we introduced an intrinsic and extrinsic motivation construct. A survey was conducted with 133 first semester students to test the proposed model. The results provide support for the importance of an intrinsic and extrinsic motivation construct to explain influence on students’ wiki use.