diff --git a/tox.ini b/tox.ini
index 87ba0a1..8ea00b2 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,7 +7,7 @@ deps=
 	pep8
 	coverage
 	pylint
-    six
+	six
 commands=
 	pep8 amodem/ scripts/
 	pylint --extension-pkg-whitelist=numpy --report=no amodem --rcfile .pylintrc