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I have a strange compilation warning for the following code, with Visual C++ 2010: #include <iostream> class test { public: template<class obj> class inner { private: // Line 11: template<int index, bool unused = true> struct AttributeName; private: template<bool b> struct AttributeName<0,b> { static inline const char* get() { return "prop"; } }; public: typedef AttributeName<0> propname; }; typedef inner<test> description; }; int main() { test t; std::cout << test::description::propname::get(); // Line 32 return 0; } The warning: file.cpp(11) : warning C4348: 'test::inner<obj>::AttributeName' : redefinition of default parameter : parameter 2 (with [ obj=test ]) file.cpp(11) : see declaration of 'test::inner<obj>::AttributeName' (with [ obj=test ]) file.cpp(32) : see reference to class template instantiation 'test::inner<obj>' being compiled (with [ obj=test ]) What I don't understand is that AttributeName "redefinition" is at the same line than the definition... sounds like a bug I noticed that making inner a non-template class removes the warning. However, this is not an option since the real code is more complicated than this testcase and need to be templated. Also, this code won't compile if warning are treated as errors... It compiles without warnings on GCC . Why msvc is outputing such warning and is there a workaround ? edit The following modification: template<int index, bool unused = true> struct AttributeName {};

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