diff --git a/.travis.yml b/.travis.yml
index 7217a6f4..c838e7d0 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,8 @@
 language: python
 
+python:
+  - "2.7_with_system_site_packages"
+
 env:
   - TOX_ENV=py27
   - TOX_ENV=docs