How do I type hint a method with the type of the enclosing class?

I have the following code in Python 3:

class Position:

    def __init__(self, x: int, y: int):
        self.x = x
        self.y = y

    def __add__(self, other: Position) -> Position:
        return Position(self.x + other.x, self.y + other.y)

But my editor (PyCharm) says that the reference Position can not be resolved (in the __add__ method). How should I specify that I expect the return type to be of type Position?

I think this is actually a PyCharm issue. It actually uses the information in its warnings, and code completion.

But correct me if I'm wrong, and need to use some other syntax.