Personality traits, and extraversion in particular, has long been unjustly neglected in applied linguistics. Some cognitive and physiological characteristics associated with extraversion, such as superior short-term memory and better resistance to stress, can explain interindividual variation in speech production. Working within the theoretical framework of Levelt [Levelt, W. J. M. (1989). Speaking. From intention to articulation. Cambridge, MA-London: ACL-MIT Press.] and de Bot [de Bot, K. (1992). A bilingual production model. Levelt's 'speaking' model adapted. Applied Linguistics, 13 (1), 1-24.], we analysed the French oral interlanguage of 25 Flemish university students and related this to their EPI scores. Correlational analyses between extraversion scores and 6 linguistic variables reflecting fluency and accuracy revealed that extravert bilinguals are more fluent than introvert bilinguals, especially in interpersonal stressful situations. Different hypotheses are presented to explain this phenomenon.