diff --git a/src/ast/Definition.cpp b/src/ast/Definition.cpp
index 6f8095490..dc7da3509 100644
--- a/src/ast/Definition.cpp
+++ b/src/ast/Definition.cpp
@@ -313,14 +313,13 @@ void EnumerationDefinition::accept( Visitor& visitor )
 //
 
 StructureDefinition::StructureDefinition( const Identifier::Ptr& identifier,
-    const NodeList< FunctionDefinition >::Ptr& functions )
+    const FunctionDefinitions::Ptr& functions )
 : Definition( Node::ID::STRUCTURE_DEFINITION, identifier )
 , m_functions( functions )
 {
 }
 
-const NodeList< FunctionDefinition >::Ptr& StructureDefinition::functions(
-    void ) const
+const FunctionDefinitions::Ptr& StructureDefinition::functions( void ) const
 {
     return m_functions;
 }
diff --git a/src/ast/Definition.h b/src/ast/Definition.h
index a43e33cb0..00696ad9a 100644
--- a/src/ast/Definition.h
+++ b/src/ast/Definition.h
@@ -225,14 +225,14 @@ namespace libcasm_fe
             using Ptr = std::shared_ptr< StructureDefinition >;
 
             StructureDefinition( const Identifier::Ptr& identifier,
-                const NodeList< FunctionDefinition >::Ptr& functions );
+                const FunctionDefinitions::Ptr& functions );
 
-            const NodeList< FunctionDefinition >::Ptr& functions( void ) const;
+            const FunctionDefinitions::Ptr& functions( void ) const;
 
             void accept( Visitor& visitor ) override final;
 
           private:
-            const NodeList< FunctionDefinition >::Ptr m_functions;
+            const FunctionDefinitions::Ptr m_functions;
         };
 
         class FeatureDefinition final : public Definition