diff --git a/tox.ini b/tox.ini
index e9f13cb..917b617 100644
--- a/tox.ini
+++ b/tox.ini
@@ -10,5 +10,5 @@ deps =
 
 commands =
   flake8 --verbose dcos tests
-  isort -rc -c --diff --verbose {envsitepackagesdir}/dcos
+  isort --recursive --check-only --diff --verbose {envsitepackagesdir}/dcos
   py.test --cov {envsitepackagesdir}/dcos tests