An existing adaptive beamforming technique, known as frequency‐domain adaptive interference rejection (FAIR), is examined for robustness with respect to nonsystematic array errors. It is concluded that, for array position errors below ±10% of the mean spacing, the FAIR technique continues to be effective. However, for special situations where large errors are encountered or where the noise situation is so favorable that better interference rejection is worthwhile, error compensation might become necessary, and a self‐calibration scheme is briefly described.