diff --git a/test/is_virtual_base_of_test.cpp b/test/is_virtual_base_of_test.cpp
index bda0e59..16707a0 100644
--- a/test/is_virtual_base_of_test.cpp
+++ b/test/is_virtual_base_of_test.cpp
@@ -45,6 +45,51 @@ struct bug11309_A { int a; };
 struct bug11309_B : public virtual bug11309_A {};
 struct bug11309_C : public bug11309_A { virtual ~bug11309_C() {} };
 
+struct bug11323_A { virtual void foo() {} };
+struct bug11323_B : public virtual bug11323_A { virtual void foo() {} };
+struct bug11323_C : public bug11323_B {};
+
+#ifndef BOOST_NO_CXX11_FINAL
+
+struct bug11323_2A { virtual void foo() = 0; };
+struct bug11323_2B : public virtual bug11323_2A { void foo() override {} };
+struct bug11323_2C : public bug11323_2B {};
+
+
+class final_non_virtual_derived final : public non_virtual_base
+{
+public:
+   final_non_virtual_derived();
+   virtual int Y();
+   virtual int X();
+};
+
+class final_virtual_derived final : public virtual non_virtual_base
+{
+public:
+   final_virtual_derived();
+   virtual int Y();
+   virtual int X();
+};
+
+#endif
+
+class protected_virtual_derived : protected virtual non_virtual_base
+{
+public:
+   protected_virtual_derived();
+   virtual int Y();
+   virtual int X();
+};
+
+class private_virtual_derived : private virtual non_virtual_base
+{
+public:
+   private_virtual_derived();
+   virtual int Y();
+   virtual int X();
+};
+
 TT_TEST_BEGIN(is_virtual_base_of)
 
 BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_virtual_base_of<Derived,Base>::value), false);
@@ -87,7 +132,16 @@ BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_virtual_base_of<non_virtual_base,non_vir
 //
 BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_virtual_base_of<bug11309_A, bug11309_C>::value), false);
 BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_virtual_base_of<bug11309_A, bug11309_B>::value), true);
-
+#if !defined(BOOST_NO_SFINAE_EXPR) && !defined(BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS) && !defined(BOOST_NO_CXX11_NULLPTR)
+BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_virtual_base_of<bug11323_B, bug11323_C>::value), false);
+#ifndef BOOST_NO_CXX11_FINAL
+BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_virtual_base_of<bug11323_2B, bug11323_2C>::value), false);
+BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_virtual_base_of<non_virtual_base, final_non_virtual_derived>::value), false);
+BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_virtual_base_of<non_virtual_base, final_virtual_derived>::value), true);
+#endif
+BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_virtual_base_of<non_virtual_base, protected_virtual_derived>::value), true);
+BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_virtual_base_of<non_virtual_base, private_virtual_derived>::value), true);
+#endif
 
 TT_TEST_END