diff --git a/include/boost/python/cross_module.hpp b/include/boost/python/cross_module.hpp
index 7c1fe507..dd1c47d2 100644
--- a/include/boost/python/cross_module.hpp
+++ b/include/boost/python/cross_module.hpp
@@ -169,6 +169,9 @@ struct export_converter_object_noncopyable : export_converter_object_base<T>
         PyErr_SetString(PyExc_RuntimeError,
           "to_python(const T&) converter not exported");
         throw import_error();
+#if defined(__MWERKS__) && __MWERKS__ <= 0x2406
+        return 0;
+#endif
     }
 
     virtual T* from_python_Ts(PyObject* p, boost::python::type<T*> t) {
diff --git a/include/boost/python/detail/extension_class.hpp b/include/boost/python/detail/extension_class.hpp
index d871ad6e..f7be9afb 100644
--- a/include/boost/python/detail/extension_class.hpp
+++ b/include/boost/python/detail/extension_class.hpp
@@ -233,6 +233,9 @@ class python_extension_class_converters
         }
         boost::python::detail::report_missing_instance_data(self, boost::python::detail::class_registry<T>::class_object(), typeid(T));
         throw boost::python::argument_error();
+#if defined(__MWERKS__) && __MWERKS__ <= 0x2406
+        return 0;
+#endif
     }
 
     // Convert to T*
@@ -261,6 +264,9 @@ class python_extension_class_converters
         }
         boost::python::detail::report_missing_ptr_data(self, boost::python::detail::class_registry<T>::class_object(), typeid(T));
         throw boost::python::argument_error();
+#if defined(__MWERKS__) && __MWERKS__ <= 0x2406
+        return *(PtrType*)0;
+#endif
     }
 
     // Extract from obj a reference to the PtrType object which is holding a