THIS STUDY investigates how speakers of Educated Yoruba English (EYE) produce the vowels in typically unstressed syllables of English words whose suffixes require a shift of stress and a consequent reduction of vowels, as in atómic from átom and dramátic from dráma. Twenty suffixed English words were read by one hundred Yoruba subjects, with a Briton who studied at the University of London serving as the control. The focus is on Yoruba English because of both its many speakers and the need for a ‘geo-tribal’ approach to defining the concept Nigerian English. The data was analysed by converting tokens of occurrence to percentages, the higher percentages being taken as the norm. The acoustic analysis was done in a computerized speech laboratory. The study establishes that vowels occurring in typically unstressed syllables in traditional Standard English remain strong and full in educated Yoruba English.