The provision of more frequent feedback to employees is increasing, although prior research has found mixed results as to the effect of increased feedback frequency on employee performance. Narcissism research identifies narcissistic oversensitivity as a key narcissistic subdimension that may result in particularly strong responses to performance feedback. We predict and find in an experiment that increased performance feedback frequency has a more negative impact on the performance accuracy of individuals with higher levels of narcissistic oversensitivity and that this negative interactive effect of feedback frequency and narcissistic oversensitivity is mitigated by the priming of a growth mindset. These results should be of practical interest to firms as they design their management control systems to improve employee performance, considering the variation in narcissistic oversensitivity among their employees. These results also contribute to recent accounting research on the effects of feedback frequency and employee mindsets.