diff --git a/tox.ini b/tox.ini
index cbe52750ae..45a51146bc 100644
--- a/tox.ini
+++ b/tox.ini
@@ -371,7 +371,7 @@ commands =
     ; use old pytest for old Python versions:
     {py2.7,py3.4,py3.5}: pip install pytest-forked==1.1.3
 
-    py.test --durations=5 {env:TESTPATH} {posargs}
+    python -m pytest --durations=5 {env:TESTPATH} {posargs}
 
 [testenv:linters]
 commands =