Person–situation interactions have attracted researchers' attention for decades. Likewise, the current work focuses on the interaction of honesty–humility and situational conditions in bringing about counterproductive work behaviour (CWB). As such, we introduce perceptions of organizational politics as a situational construct representing an opportunity for CWB. In a sample of N = 148 employees we found that particularly individuals low in honesty–humility were affected by situational circumstances. By contrast, those high in honesty–humility reported practically the same (lower) amount of CWB independent of the level of perceptions of organizational politics. In other words, employees low in honesty–humility were especially likely to condition their behaviour on environmental factors, a result that mirrors previous findings. Copyright © 2010 John Wiley & Sons, Ltd.