diff --git a/.travis.yml b/.travis.yml
index 80e6fd7..8a43c47 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,6 +12,10 @@ matrix:
         - python: "3.7"
           dist: xenial
           sudo: true
+        - name: "flake8"
+          install: pip install flake8
+          script: flake8 src setup.py
+          after_success:
 install:
     - pip install -U pip setuptools
     - pip install -U coverage coveralls
diff --git a/setup.cfg b/setup.cfg
index 2a9acf1..c1e4c65 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,2 +1,5 @@
 [bdist_wheel]
 universal = 1
+
+[flake8]
+doctests = yes
diff --git a/tox.ini b/tox.ini
index e9fb615..20efb09 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 envlist =
-   py27,py34,py35,py36,py37,pypy,pypy3,coverage,docs
+   flake8,py27,py34,py35,py36,py37,pypy,pypy3,coverage,docs
 
 [testenv]
 commands =
@@ -24,3 +24,8 @@ commands =
     sphinx-build -b html -d docs/_build/doctrees docs docs/_build/html
 deps =
     .[docs]
+
+[testenv:flake8]
+deps = flake8
+skipinstall = true
+commands = flake8 setup.py src