Avast blocking steam game Garry's Mod HL2.exe

Avast Premier keeps removing HL2.exe from the Garry’s mod installation in steam. I am sure this is a false positive an people using the free version with the latest update don’t seem to have that problem anymore. I use Vast Premier but is still have this annoying issue. Of course i know i can exclude folders and files, but i don’t want to. This should just work Please address this issue asap.

https://dl.dropboxusercontent.com/u/2192987/30-11-2014%2013-18-22.png

What is the file name it gives for the malware?

Disable your shields and try again.

It is called Win32:Evo-Gen [Sups] and disabling Avast solves the problem, and i can play again. But i am sure this is an false positive.

Detected as Suspicious …

You can report it here https://support.avast.com

Or you can send file/report from avast chest http://www.avast.com/en-eu/faq.php?article=AVKB21#artTitle