Enum class error

Hey,

is it known that the following code produces an error, but compiles just fine?

enum class Color {RED, GREEN, BLUE};

Color color = Color::GREEN; //error: 'Taking enum type 'Color' from Integer

if(color == Color::GREEN) { //error: 'Types 'color' and 'int' are not compatible
    cout << "true" << endl;
}

changing Color color to int color removes the error, but I prefer keeping Color there.