Teachers play an essential role in fostering linguistic security in their classrooms. The aim of this study is to identify the language ideologies articulated by teachers in the Francophone schools of the English-dominant context of British Columbia (Canada) in order to explore how the different practices they implement to foster the use of French in their multilingual classrooms and foster linguistic security may interact and expose contradictions. The findings are based on a thematic analysis of interviews with twenty-one French-speaking high school teachers. I argue that linguistic ideologies provide a useful locus for studying the tensions produced by institutional policies and practices and the possible impact on the students' feelings of linguistic insecurity. Building on excerpts from the interviews, the findings indicate that the practices the teachers use to implement the French-language policy in their classrooms must be examined further as they might be harming the efforts they are making to increase linguistic security. This paper is intended to contribute to the ongoing conversation about the practical process of engaging with linguistic insecurity.