Curiously recurring template pattern (CRTP) with static constexpr in Clang

Consider my simple example below:

#include <iostream>

template <typename T>
class Base
{
public:
    static constexpr int y = T::x;
};

class Derived : public Base<Derived>
{
public:
    static constexpr int x = 5;
};


int main()
{
    std::cout << Derived::y << std::endl;
}

In g++, this compiles fine and prints 5 as expected. In Clang, however, it fails to compile with the error no member named 'x' in 'Derived'. As far as I can tell this is correct code. Is there something wrong with what I am doing, and if not, is there a way to have this work in Clang?