diff --git a/.travis.yml b/.travis.yml
index c7049be94..bdced1ad9 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -32,6 +32,7 @@ addons:
       - unzip
       - python-numpy
       - python-scipy
+      - python-sklearn
 
 before_install:
   - scripts/travis_osx_install.sh