Should courts, when applying foreign law, assess the validity or legality of foreign legislative or executive acts therein? The foreign act of state doctrine answers that question in the negative, but is often criticised as lacking a sound theoretical basis. This article argues, however, that the doctrine remains defensible if reconceptualised as a rule of private international law, which furthers the modest goal of international uniformity within the choice-of-law process. Assessing the validity or legality of foreign legislative and executive acts necessarily requires courts to address questions of foreign public law. Given the fact-specific and flexible nature of public law adjudication, courts cannot answer these questions, and thus cannot carry out such assessments, in a manner that loyally applies foreign law. The doctrine, then, makes the best of a bad situation, by sidestepping that problem with a clear rule of refusal which, if consistently applied, furthers international uniformity.