diff --git a/web.py b/web.py
index 823b44e..b143408 100644
--- a/web.py
+++ b/web.py
@@ -31,11 +31,11 @@ from pygments.formatters import HtmlFormatter
 
 # The root folder where Gitolite stores the repositories. This is used to find the
 # actual repositories.
-GITOLITE_REPOSITORIES_ROOT = '/home/git/repositories'
+GITOLITE_REPOSITORIES_ROOT = os.environ.get(GITOLITE_REPOSITORIES_ROOT, '/home/git/repositories')
 
 # These are only used when anonymous cloning over HTTPS
-GITOLITE_SHELL = '/home/git/bin/gitolite-shell'
-GITOLITE_HTTP_HOME = '/home/git'
+GITOLITE_SHELL = os.environ.get(GITOLITE_SHELL, '/home/git/bin/gitolite-shell')
+GITOLITE_HTTP_HOME = os.environ.get(GITOLITE_HTTP_HOME, '/home/git')
 
 # The domain of this instance. This is only really used when displaying list addresses,
 # or when the domain needs to be displayed on some pages.