diff --git a/.travis.yml b/.travis.yml
index 5e5ede8..95db960 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,9 +6,9 @@ python:
   - 3.5
 
 install:
-  - pip install tox
+  - pip install tox flake8
 
 script:
-  - tox -r
+  - tox -r -e py
 
 sudo: false