diff --git a/src/gen_extclass.py b/src/gen_extclass.py
index 57189a7d..b794dc2c 100644
--- a/src/gen_extclass.py
+++ b/src/gen_extclass.py
@@ -238,6 +238,9 @@ 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*
@@ -266,6 +269,10 @@ 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
+        PtrType x;
+        return x;
+#endif
     }
 
     // Extract from obj a reference to the PtrType object which is holding a