diff --git a/.travis.yml b/.travis.yml
index f96caf8..63c9582 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,6 +11,7 @@ env:
 sudo: false
 
 install:
+- travis_retry pip install tox
 - travis_retry pip install coveralls
 
 script: tox