diff --git a/.travis.yml b/.travis.yml
index 52b3f5e9..c602bb2f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,18 +1,13 @@
 language: python
-
 python:
-  - 2.6
-  - 2.7
-  - 3.2
-  - 3.3
-  - pypy
-
+  - "2.6"
+  - "2.7"
+  - "3.3"
+  - "pypy"
 install:
-  - pip install -r requirements_dev.txt --use-mirrors
-  - python setup.py install
-
-script: py.test tests/
-
+  - "pip install -r requirements_dev.txt --use-mirrors"
+  - "python setup.py install"
+script: py.test -x tests/
 branches:
   only:
     - master