diff --git a/.travis.yml b/.travis.yml
index b4d5da3a5..9aca4f3d4 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -24,7 +24,8 @@ matrix:
   fast_finish: true
 
 install:
-  - pip install tox
+  # Virtualenv < 14 is required to keep the Python 3.2 builds running.
+  - pip install tox "virtualenv<14"
 
 script:
     - tox -e $TOX_ENV