How to block "referer URL" of Admin CP?

[Vampyre]

Hello,

I've added a third party hit counter to my main forum area, but not in the Admin CP.

When setting up and maintaining forums via Admin CP, sometimes, I have to click URLs to the main forums.
The Admin CP URL shows up as the "referer" in the hit counter.

May I ask how I can block referer (from the Admin CP) from showing up in the hit counter stats, please?
(the reason being that I prefer not to publicize the URL of my Admin CP.)

Thanks in advance for your advice.