Laughter is one of the most encountered paralinguistic phenomena in conversation. Similarly to other communicative elements, evidence for laughter convergence, in particular for its temporal distribution and its acoustic marking, has been found between interlocutors. We investigate here whether segmental-level convergence effects, previously observed for speech, may be also found in the case of laughter. Using a corpus of dyadic interactions, we evaluate phonetic convergence of the vocalic part of laughs, by means of distances between the formant values. This was carried out for two proposed measures of convergence: global – at the level of the entire conversation, and local – considering consecutive laughs. Our global measure results reveal that interlocutors converge towards the end of the interaction, compared to its beginning, although important individual variation exists. With respect to the local measure, our findings show a lack of phonetic convergence (or divergence) between conversational partners.