How to pass enum as default argument

I am having an issue with passing an enum as a default argument to a
class method.  I have a class similar to

enum Method { a, b };

class A{
    A();
    void MyMethod(int i, Method m = a){
    ...
   }
}

The compiler error I get says

error: default argument for 'Method m' has type '<unknown type>'

How can I use a default argument for an enum?

Thanks,
Jeremy

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