diff --git a/library/tox.ini b/library/tox.ini
index 88e1021..5dd120a 100644
--- a/library/tox.ini
+++ b/library/tox.ini
@@ -5,7 +5,7 @@ skip_missing_interpreters = True
 [testenv]
 commands =
 	python setup.py install
-	coverage run -m py.test -v -r wsx
+	coverage run -m pytest -v -r wsx
 	coverage report
 deps =
 	mock