diff --git a/vdirsyncer/storage/google.py b/vdirsyncer/storage/google.py
index db4bd14..4b6088b 100644
--- a/vdirsyncer/storage/google.py
+++ b/vdirsyncer/storage/google.py
@@ -2,6 +2,7 @@
 
 import json
 import logging
+import os
 import urllib.parse as urlparse
 
 from atomicwrites import atomic_write