“…Two theoretical contributions are made in this study. First, while most of the research on employee voice have studied positively-intended voice (Ma, 2016;Maynes & Podsakoff, 2014), this study contributes to the small but expanding body of research on Maynes and Podsakoff's (2014) negative voice behaviour of defensive voice (Bharanitharan et al, 2019;Déprez et al, 2019;Duan et al, 2021;Liu et al, 2021;Lu et al, 2019;Ma, 2016;Ng et al, 2021;Unler & Caliskan, 2019) by showing a negative relationship between PO (job-based) or PO (organisationbased) and negatively-intended defensive voice to supervisor. Second, although current literature has reported a moderating effect of PDO on several relationships featuring employee voice as the criterion variable (Botero & Van Dyne, 2009;Lin et al, 2019) and PO as the mediating variable (Liu et al, 2012), to the best of the authors' knowledge, this is the earliest study to show the moderating effect of employee PDO on the relationships between PO (organisation-based and job based) and defensive voice to supervisor.…”