Marginalization in decision-making discourse results in disempowerment of the marginalized and detracts from the efficacy of participatory decision making. In ESL contexts, it is usually associated with English proficiency. But this view ignores the influence of preferences for different participation styles, an understanding of which is essential for the development of effective pedagogical remedies to the problem of marginalization. The present study addresses this gap by investigating discourse participation and marginalization from a participation styles perspective. Findings reveal that marginalization resulted from a failure to adopt turn-taking strategies associated with dominant participation styles. Implications for pedagogy are discussed.