Workaround for blocking async?

The async call below is blocking because the destructor of the returned future is blocking:

void foo() {}

void foo_async() {
    std::async(std::launch::async, foo);
}

But I don't want to block!

I'm considering to use the following workaround:

void foo_async() {
    std::thread(foo).detach();
}

Is this ok? Or would you recommend a different solution?