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This study investigated the role of morphological structure in explaining pronunciation variation. The focus was on the Dutch derivational suffix-igheid (//), which occurs in two types of words. In the first type,-igheid is analyzed as a single suffix. In the second type, there is a morphological boundary between-ig and-heid. The main research question was whether this difference is reflected in the duration of the / / cluster. Two hypotheses were distinguished: one based on prosodic structure, which predicts that the cluster is shorter in the first type than in the second type, and one based on the informativeness of the affix given the morphological paradigm, which makes the opposite prediction. All occurrences of-igheid in a corpus of read speech were acoustically analyzed using Automatic Speech Recognition technology. The duration of the / / cluster was found to be shorter in words of the second type than in words of the first type. This can be explained by the observation that words of the second type have sparser morphological paradigms, making the cluster less informative with respect to word identity. Furthermore, this finding shows that morphological effects on fine phonetic detail cannot always be explained by prosodic structure