diff --git a/compiler/cpp/src/generate/t_alterl_generator.cc b/compiler/cpp/src/generate/t_alterl_generator.cc
index 1981dff..9f75387 100644
--- a/compiler/cpp/src/generate/t_alterl_generator.cc
+++ b/compiler/cpp/src/generate/t_alterl_generator.cc
@@ -773,5 +773,5 @@
 }
 
 std::string t_alterl_generator::type_module(t_type* ttype) {
-  return ttype->get_program()->get_name() + "_types";
+  return uncapitalize(ttype->get_program()->get_name()) + "_types";
 }