diff --git a/.travis.yml b/.travis.yml
index 2d780e81..ed1531b9 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,6 +8,8 @@ python:
   - "3.6"
   - "nightly"
   - "pypy3"
+before_install: pip install flake8
+before_script: flake8 . --count --select=E901,E999,F821,F822,F823 --show-source --statistics
 script: make test
 sudo: false
 notifications: