We propose a syntactic approach to apparent blocking effects in the realization of definiteness marking in the Scandinavian languages. The claim is that the differences in definiteness marking can be attributed to a requirement that a definiteness feature ([def], a property of N) must be located at the left edge of the DP phase in order to be PIC-accessible for probes outside of the DP. As a result, [def] can be spelled out on N if N is the only element within DP and [def] is therefore part of DP’s edge domain (giving rise to suffixal marking). In contrast, the presence of an (overt) adjectival modifier (at the left edge of DP) requires feature movement of [def] to D, which is then realized as a prenominal article (with additional spell-out of the lower copy of [def] in Swedish). The paper also addresses the (slightly different) behavior of definiteness marking in the context of relative clauses and certain issues pertaining to the interpretation of the different strategies.