Issue with /Elements/Header CallbackName => 'Head' rendering before squished js that loads jQuery

I am trying to get RT::Extensions::Hotkeys working and I am facing several

ReferenceError: jQuery is not defined

Errors in my Javascript console.

I suspect the errors come from the fact that jQuery is being loaded in the
squished JS file and the file is loaded after the Callback that has a first
jquery call in that plugin, like this:

<style type="text/css" media="all"


I tried to find some other Callback that would be loaded after the squish,
but even Javascript->Data gets loaded before it.

Is that something particular to my installation? If not, how can I make
jquery load before the Header Callback?