diff --git a/tox.ini b/tox.ini
index 1657e13..a6ded79 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,8 +1,12 @@
 [tox]
 envlist = py27,py35,py37
 [testenv]
-deps=pytest
-commands=pytest
+deps =
+  flake8
+  pytest
+commands =
+  flake8
+  pytest
 
 [flake8]
 exclude = build,dist,*.egg-info,.cache,.git,.tox,__pycache__