Can you use the address of a constexpr variable?

I have a variable whose address is passed as the fourth parameter to setsocketopt. Notice that this parameter is declared as a constant pointer (const void *optval).

In a patch I put up for review I changed the declaration of that variable to static constexpr. A reviewer of this change had concerns: he felt that it was questionable whether you can always take the address of a constexpr. He suggests that I make it const. I couldn't find much about addresses of constexpr variables and concerns about it after googling around. Can someone explain what the guarantees are concerning the address of a constexpr variable and what the caveats are about using it (if any)?

In case it's helpful, here's the code (I added static constexpr, it was just an int before):

static constexpr int ONE = 1;
setsockopt(socket_fd, IPPROTO_TCP, TCP_NODELAY, &ONE, sizeof(ONE));

Thanks!