Segment prolongation has been shown to be one of the most common forms of non-pathological speech disfluency. The distribution in the word (initial– medial–final segment) seems to vary across languages based on morphological complexity, making it interesting to study segment prolongation in languages that exhibit different degrees of morphological complexity. In this paper we study segment prolongation in Hungarian, a language with very complex morphology. Our results indicated that distribution of prolongations according to their placements in words in Hungarian is comparable to English and Swedish, with a similar degree of morphological complexity, but not to Japanese or Mandarin Chinese, languages with a less complex morphology. Prolongations involve more vowels than consonants, more function words than content words, and word length does not influence the duration of the prolonged segment. Phonologically long vowels were produced shorter durations than phonologically short vowels. Finally, we suggest a ‘phonotactics matters hypothesis”, emphasizing the complexity of permissible syllable structures, which seems to be the main cause of the observed differences in how prolongation is realized in different languages.