diff --git a/.travis.yml b/.travis.yml
index 9c51edb..31226f2 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,10 @@
 language: python
 sudo: false
 
+os:
+  - linux
+  - osx
+
 cache:
   directories: test/cache