What is the Reason why using does not work with uint8_t?

I tried to modernise C++ code to C++11, converting typedef statements to using statements:

class Configuration {
    typedef uint8_t Protocols;

Into:

class Configuration {
    using Protocols = uint8_t;

Where I get this error message from Visual Studio 2012:

error C2873: 'Protocols' : symbol cannot be used in a using-declaration

What is the reason why I can not use using there?