College students were randomly assigned to receive either (a) standard alcohol programming (SAP) or (b) SAP plus an intervention designed to change perceptions of alcohol norms (PAN). Effects of the intervention delivered during one class period (i.e., 55 minutes) were assessed using pre- and post-intervention surveys about personal alcohol use and perceptions of other students' drinking. Compared to students in the SAP only condition (N = 472), those receiving the PAN intervention (N = 402) reported significant reductions in perceived peer drinking; but minimal differences in self-reported drinking. These results replicate the findings from the previous year of implementation of the PAN intervention and raise concerns about the practical and empirical validity of brief social norming interventions designed to reduce drinking among college students.