Bureaucratic elites and national public administrations' experts play a key role in the preparation of supranational policies and in shaping global governance instruments. However, we know surprisingly little about what factors drive their preferences and support for supranational solutions. Drawing on the results of a vignette and conjoint experiment and the case of the European Commission's policy initiative to develop European Public Sector Accounting Standards, this study analyzes the effect of the communicative framing of a policy's objective and how experts' attitudes influence their preferences for policy outcomes. The study shows that the communicative framing of a policy's objective based on functional needs rather than on normative grounds increases support among national administrations' experts. Moreover, the study finds evidence that experts who internalized a public service motivation and those with a supranationalist collective identity are more willing to give up national sovereignty in favor of supranational policy solutions.