In case-marking languages like German, nonstandard nominative-dative verbs lead to enhanced processing costs. So far, it is unclear if these case-marking effects reflect the special syntax or semantics of nominative-dative verbs. We present the results of two ERP experiments aimed to disentangle semantic and syntactic contributions to lexical case-marking by manipulating object animacy and case-marking for two verb types: simple verbs (nonstandard syntax and semantics for nominative-dative verbs) and particle verbs (nonstandard semantics only). Simple nominative-dative verbs show effects of case-marking, and no animacy effects. Particle verbs show no effects of case-marking, and animacy effects for nominative-accusative and nominative-dative verbs. Our findings suggest that lexical case-marking effects reflect the special syntax, rather than semantics, of simple nominative-dative verbs.