diff --git a/include/boost/sml.hpp b/include/boost/sml.hpp
index 6badf558..f811dfde 100644
--- a/include/boost/sml.hpp
+++ b/include/boost/sml.hpp
@@ -581,13 +581,13 @@ auto get_type_name(const char *ptr, index_sequence<Ns...>) {
 template <class T>
 const char *get_type_name() {
 #if defined(_MSC_VER) && !defined(__clang__)
-  return detail::get_type_name<T, 39>(__FUNCSIG__, make_index_sequence<sizeof(__FUNCSIG__) - 39 - 8>{});
+  return detail::get_type_name<T, 65>(__FUNCSIG__, make_index_sequence<sizeof(__FUNCSIG__) - 65 - 8>{});
 #elif defined(__clang__) && (__clang_major__ >= 12)
   return detail::get_type_name<T, 50>(__PRETTY_FUNCTION__, make_index_sequence<sizeof(__PRETTY_FUNCTION__) - 50 - 2>{});
 #elif defined(__clang__)
   return detail::get_type_name<T, 63>(__PRETTY_FUNCTION__, make_index_sequence<sizeof(__PRETTY_FUNCTION__) - 63 - 2>{});
 #elif defined(__GNUC__)
-  return detail::get_type_name<T, 68>(__PRETTY_FUNCTION__, make_index_sequence<sizeof(__PRETTY_FUNCTION__) - 68 - 2>{});
+  return detail::get_type_name<T, 69>(__PRETTY_FUNCTION__, make_index_sequence<sizeof(__PRETTY_FUNCTION__) - 69 - 2>{});
 #endif
 }
 #if defined(__cpp_nontype_template_parameter_class) || \
diff --git a/test/ut/type_traits.cpp b/test/ut/type_traits.cpp
index 737c71e5..2f9a81bf 100644
--- a/test/ut/type_traits.cpp
+++ b/test/ut/type_traits.cpp
@@ -5,6 +5,8 @@
 // (See accompanying file LICENSE_1_0.txt or copy at
 // http://www.boost.org/LICENSE_1_0.txt)
 //
+#include <string>
+
 #include "boost/sml.hpp"
 
 BOOST_SML_NAMESPACE_BEGIN
@@ -67,5 +69,10 @@ test is_empty_type = [] {
   static_expect(!is_empty<non_empty>::value);
 };
 
+test type_name = [] {
+  expect(std::string("int") == get_type_name<int>());
+  expect(std::string("void") == get_type_name<void>());
+};
+
 }  // namespace aux
 BOOST_SML_NAMESPACE_END