Why does the C++ compiler complain about disabled unary operator?

I'd like to be able to disable an overloaded operator function based on template parameters like so

template <int T>
 class Foo {
  int v;

  template <std::enable_if_t<T == 0, int> = 0>
  Foo operator-() const
  {
    return {-v};
  }
};

But when I try to instantiate a Foo with a value that would disable the function (i.e. 1) the compiler complains

Foo<0> f0; // This compiles
Foo<1> f1; // This does not

I am not trying to invoke the disabled function but the compile complains about being unable to access it.

Any explanations of this behavior?