diff --git a/.travis.yml b/.travis.yml
index e6194f2..9e7b9f1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,7 +2,7 @@ language: python
 python:
   - "3.3"
 virtualenv:
-  system_site_packages: true
+  - "3.3_with_system_site_packages"
 before_install:
   - "sudo apt-get install -qq python3-sphinx"
 install: