Objective. In this article we examine the NPO's commitment to be involved in advocacy activities and the strategies which they rely on to fulfill this expressive role. We question whether the close (financial) relationship between governments and NPO's in Flanders, especially defined in terms of service delivery, will stifle the NPO's advocacy or rather creates new opportunities for giving NPO's a voice in the development of new public policies as well. Method. Using data from a recent large-N survey of Flemish private nonprofit suppliers in four social welfare areas we will conduct multivariate regression analysis to determine which factors could help us to predict the NPO's advocacy behavior. Results. In general, Flemish NPO's indicate a rather low commitment to their advocacy role. However, once NPO's become politically active they rely on a variety of different strategies, especially by utilizing their insider contacts with policy makers and by joining forces into coalitions with other organizations. Conclusion. Our findings suggest that under third-party government regimes NPO's advocacy does not necessarily have to be seen as something conflictual.Instead, advocacy may lead to further cooperation as NPO's become increasingly recognized by governments for their capacity to enrich public policy making from a grassroots perspective.