diff --git a/.travis.yml b/.travis.yml
index c05d72a9..4189506e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,7 @@
 language: python
+os:
+  - linux
+  - osx
 python:
   - "2.7"
   - "3.3"