.git grows after git-gc?

Hello,

Not important at all, but I was surprised to see this:

$ git fetch \
   git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-2.6.16.y.git \
   refs/heads/master:refs/remotes/vendor
remote: Generating pack...
remote: Done counting 194409 objects.
remote: Deltifying 194409 objects.
remote:  100% (194409/194409) done
Indexing 194409 objects.
remote: Total 194409 (delta 147074), reused 179896 (delta 138737)
 100% (194409/194409) done
Resolving 147074 deltas.
 100% (147074/147074) done
* refs/remotes/vendor: storing branch 'master' of 
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-2.6.16.y
  commit: 7a715c6

$ du -h .git 95M .git

$ git-gc --prune
Generating pack...
Done counting 194520 objects.
Deltifying 194520 objects...
 100% (194520/194520) done
Writing 194520 objects...
 100% (194520/194520) done
Total 194520 (delta 147074), reused 194520 (delta 147074)
Pack pack-220cec9989ebd8b75963de71742861c6adbeda7d created.
Removing unused objects 100%...
Done.

$ du -h .git 97M .git

That's a bit odd isn't it?

Andy