diff --git a/include/wrenpp/class_manager.hpp b/include/wrenpp/class_manager.hpp
index d3345fb..457108b 100644
--- a/include/wrenpp/class_manager.hpp
+++ b/include/wrenpp/class_manager.hpp
@@ -79,7 +79,7 @@ namespace wren {
 		ClassManager();
 		~ClassManager() noexcept;
 
-		void add_class_maker (std::string_view module_name, std::string_view class_name, make_foreign_class_t);
+		ClassManager& add_class_maker (std::string_view module_name, std::string_view class_name, make_foreign_class_t);
 		foreign_class_t make_class(std::string_view module_name, std::string_view class_name);
 
 	private:
diff --git a/src/class_manager.cpp b/src/class_manager.cpp
index f0499c3..859f6ef 100644
--- a/src/class_manager.cpp
+++ b/src/class_manager.cpp
@@ -74,7 +74,7 @@ namespace wren {
 	ClassManager::ClassManager() = default;
 	ClassManager::~ClassManager() noexcept = default;
 
-	void ClassManager::add_class_maker (std::string_view module_name, std::string_view class_name, make_foreign_class_t maker) {
+	ClassManager& ClassManager::add_class_maker (std::string_view module_name, std::string_view class_name, make_foreign_class_t maker) {
 		using detail::TempClassName;
 		using detail::ClassNameOwning;
 
@@ -83,6 +83,8 @@ namespace wren {
 			m_classes.insert(it_found, std::make_pair(ClassNameOwning{module_name, class_name}, maker));
 		else
 			it_found->second = maker;
+
+		return *this;
 	}
 
 	foreign_class_t ClassManager::make_class (std::string_view module_name, std::string_view class_name) {