diff --git a/opcua/server/address_space.py b/opcua/server/address_space.py
index 547e1789..51363db2 100644
--- a/opcua/server/address_space.py
+++ b/opcua/server/address_space.py
@@ -311,7 +311,7 @@ def _add_type_definition(self, nodedata, item):
         addref.IsForward = True
         addref.ReferenceTypeId = ua.NodeId(ua.ObjectIds.HasTypeDefinition)
         addref.TargetNodeId = item.TypeDefinition
-        addref.TargetNodeClass = ua.NodeClass.DataType
+        addref.TargetNodeClass = ua.NodeClass.ObjectType
         self._add_reference_no_check(nodedata, addref)
 
     def delete_nodes(self, deletenodeitems, user=UserManager.User.Admin):