We study a principal-agent problem where we model the uncertainty regarding the relationship between the level of effort and the monetary outcome using the smooth ambiguity model (Klibanoff et al., 2005). We provide comparative statics on the optimal wage scheme when the agent has constant absolute ambiguity aversion (CAAA) preferences. Our main result implies that whether the optimal wage scheme should be higher-powered or lower-powered depends on an intuitive measure of ambiguity.