diff --git a/tox.ini b/tox.ini
index c2fa9af28..e75113f01 100644
--- a/tox.ini
+++ b/tox.ini
@@ -51,6 +51,9 @@ deps =
     cssselect==0.9.1
     zope.interface==4.1.1
     -rtests/requirements.txt
+# Not used directly but allows boto GCE plugins to load.
+# https://github.com/GoogleCloudPlatform/compute-image-packages/issues/262
+    google-compute-engine==2.8.12
 
 [testenv:trunk]
 basepython = python2.7