This study examines the durational and spectral correlates of word boundaries with pseudo-word sequences. The productions from one female native French speaker were extracted from short sentence contexts that induced two lexical segmentations of the same phonemic strings, either a word-final enchaînement consonant (CCV 1 C p #V 2 CV) or a word-initial consonant (CCV 1 #C p V 2 CV). Longer durations and lower F 1 were observed for V 1 in CCV 1 C p #V 2 CV. Similarly, longer durations were found for C p and V 2 when corresponding to word onset. Thus, phonetic cues to lexical segmentation are available in the signal, even for non-word constituents. Although the perceptual influence of these subtle cues remains to be demonstrated, the findings are consistent with a syllable-based segmentation heuristic that could be guided by such lexical structure cues to avoid missegmentations.