Perfectionism is a component of multiple disorders, necessitating valid measurement. However, most perfectionism research has used predominantly White samples, a notable limitation for many reasons including past findings that different sociocultural factors can impact perfectionistic tendencies. As similar dynamics might be deleterious to the validity of perfectionism measures by way of predictive bias, the present study investigated the predictive invariance of the Big Three Perfectionism Scale (BTPS) when predicting mistake rumination using a college student convenience sample. Despite small variations in model parameters across groups, model comparisons demonstrated the BTPS's predictive invariance and offer evidence suggesting the BTPS is a valid measure of perfectionism in its prediction of mistake rumination among individuals of different races.