diff --git a/.travis.yml b/.travis.yml
index f0890ba..857a9aa 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,9 +1,11 @@
 language: python
 python: 2.7
-
 services:
   - memcached
 env:
+  - MEMCACHED_URL=mc://localhost:11211 TOX_ENV=py26
+  - MEMCACHED_URL=mc://localhost:11211 TOX_ENV=py27
+  - MEMCACHED_URL=mc://localhost:11211 TOX_ENV=py27-opt
   - MEMCACHED_URL=mc://localhost:11211 TOX_ENV=pypy
 install:
   - pip install tox