Although Malawi is multilingual, Chichewa language has dominated both commercial and public radio stations since independence due to political and economic reasons. This study, therefore, intended to investigate language use on Radio Islam Malawi and suggest ways of levelling up the linguistic terrain on the radio’s airwaves. Radio Islam Malawi is a non-profit religious broadcaster established to contribute to the country’s socio-economic and moral development. To attract a wide listenership, religious radios are ideally supposed to broadcast in all major ethnic languages. Through observation, document analysis and in-depth interviews, the study found that apart from Chichewa, Chiyao language also has a substantial share of the radio’s airtime. From an ethnolinguistic vitality theory, Chiyao speakers are a majority both in the radio’s staffing and targeted audience and that may influence convergence in their linguistic choice. However, based on communication accommodation theory, this may alienate underrepresented ethnic groups from listening to the radio. Therefore, this study argues that while Radio Islam Malawi has helped in the inclusion of Chiyao into Malawi’s airwaves, it can also minimise the marginalisation of other ethnic languages through deliberate staffing from underrepresented ethnolinguistic groups and introducing programmes in marginalised ethnic languages. This will attract a wide listenership while promoting multilingualism and people’s sense of identity.