PHP Completion For Base Class Members Follow

How do I get PHPstorm to complete base class members in derived class? For example, I have some code like this:

public class Foo extends Bar {
     ....
}

public class Bar {
     ....
}

Bar has some methods and variables that are used in Foo, and in other classes extending Bar, but I don't seem to get them for completion in the IDE when hitting Ctrl-Space, and the IDE actively marks them as missing (even though when running my webapp, they work just fine).

Everything is marked public, so it should show up, but nothing does. Is there something I'm missing?