diff --git a/tools/download_file.py b/tools/download_file.py
index 092a81f..1900b20 100755
--- a/tools/download_file.py
+++ b/tools/download_file.py
@@ -17,7 +17,7 @@
 
 from hashlib import sha1
 from optparse import OptionParser
-from os import link, makedirs, path, remove
+from os import environ, link, makedirs, path, remove
 import shutil
 from subprocess import check_call, CalledProcessError
 from sys import stderr
@@ -25,7 +25,10 @@
 from zipfile import ZipFile, BadZipfile, LargeZipFile
 
 GERRIT_HOME = path.expanduser('~/.gerritcodereview')
-CACHE_DIR = path.join(GERRIT_HOME, 'bazel-cache', 'downloaded-artifacts')
+CACHE_DIR = environ.get(
+    'GERRIT_CACHE_HOME',
+    path.join(GERRIT_HOME, 'bazel-cache', 'downloaded-artifacts'))
+
 LOCAL_PROPERTIES = 'local.properties'