class MyClass : public QObject {
Q_OBJECT
public:
  enum MyEnum { One, Two, Three }; // not using enum class here
  Q_ENUM(MyEnum);
public:
  MyClass(QObject* parent = 0);

  Q_INVOKABLE void doSomethingWithEnum(int my_enum = One); // <-- shiboken fails here
};

// function definitions for completeness (originally in cpp file)
MyClass::MyClass(QObject* parent) : QObject(parent) {}
MyClass::doSomethingWithEnum(int my_enum) { /* do something with it */ }

void sbk_wrapped_my_class_do_something_with_enum(/* PyObject etc. */) {
  // only the relevant code
  PyInt tmp_value = MyEnum::One; // not sure the type is correct, but it doesn't matter here
  // --> should be MyClass::One (or MyClass::MyEnum::One for an enum class)
}