diff --git a/include/matador/object/schema.hpp b/include/matador/object/schema.hpp
index 5878e8a..9e4780b 100644
--- a/include/matador/object/schema.hpp
+++ b/include/matador/object/schema.hpp
@@ -24,7 +24,7 @@ public:
   explicit schema( const std::string& name = "");
 
   template <typename Type>
-  utils::result<void, utils::error> attach(const std::string name, const std::string &parent = "") {
+  [[nodiscard]] utils::result<void, utils::error> attach(const std::string name, const std::string &parent = "") {
     auto node = schema_node::make_node<Type>(*this, name);
 
     auto result = attach_node(node, parent);
@@ -36,7 +36,7 @@ public:
   }
 
   template <typename Type, typename ParentType>
-  utils::result<void, utils::error> attach(const std::string name) {
+  [[nodiscard]] utils::result<void, utils::error> attach(const std::string name) {
     auto node = schema_node::make_node<Type>(*this, name);
 
     auto result = attach_node(node, std::type_index(typeid(ParentType)));