Structural equation modelling is used to measure the existence of a response style (in particular, acquiescence) behind three balanced Likert scales measuring different concepts in a questionnaire for student evaluation of teaching in higher education. Exploration with one sample (n = 1125) and confirmation in a second sample (n = 710) from a different population (different students, different courses) shows the existence of a common factor behind these scales. However, the weak correlation with the variable "sum of agreements" does not support the idea of acquiescence in student evaluation of teaching. Instead, the common factor could be interpreted as a halo factor influencing different scales in the questionnaire. The implications of this exploratory study for future research on acquiescence in student evaluations of teaching are discussed. (Contains 4 tables, 4 notes and 2 figures.)