The aim of this study is to determine whether the phonological process of degemination, in which one of two adjacent and identical consonants is deleted, is perceptually complete when it applies over word boundaries. Measurements on the duration of the boundary consonant have shown durational differences between two-word phrases with underlying single and double consonants, even at fast speech rates. Results of a pseudo-gating experiment using a binary forced choice task show that correct segmentation of two-word phrases with underlying single or double consonants, spoken at a fast speech rate, does not exceed chance level. We conclude, therefore, that degemination actually occurs in Dutch and that this process is perceptually complete. Implications for word recognition will also be discussed.