git gc annoyance

Whenever I run 'git gc' all of the files in .git/logs/refs/remotes/ 
tags get touched with the current timestamp.

I use unison to sync my working directories between home and work and  
these files show up as changed unnecessarily.  Since they are all zero- 
byte files
clearly they haven't changed.  It would be more efficient to not touch  
the file if it already exists to leave the old timestamp in place.