Using vs typedef in class

I thought the new using syntax in C++11 and typedef were equivalent (except for templates). But it seems that with using it is also not possible to declare a class member.

class A {
   //... Public members 
private:
    typedef std::vector<double> vector_double; 
    using vector_int = std::vector<int>;        

    void bar(vector_double& vecDouble); // type can be used
    void foo(vector_int& vecInt); // type can't be used: synatx error
 // ... Possible other private members
}

When I try to use the type vector_int in one of the member functions of class A I get a compiler error: syntax error: identifier 'vector_int'.

Am I doing something wrong here or is defining a member type not possible with using?