This paper presents the results of a survey carried out in 2008 on language use and attitudes among the Iban and Murut (Lun Bawang) living in the Temburong district of Brunei Darussalam. The article opens with a brief outline of the research conducted so far, a sociolinguistic sketch of Brunei, and an introduction to Temburong and the Iban and Murut peoples, followed by an analysis of the data gathered. The central part of the article compares the results obtained from the younger and the older age groups in the two communities in order to determine the degree of language shift that is taking place toward Malay, the national language. The article closes with some general considerations, including the possible reasons for the situations observed.