diff --git a/tox.ini b/tox.ini
index 90f42dee9..4aced8de5 100644
--- a/tox.ini
+++ b/tox.ini
@@ -170,7 +170,7 @@ deps =
     {[pinned]deps}
     PyPyDispatcher==2.1.0
 commands =
-    pytest --durations=10 scrapy tests
+    pytest {posargs:--durations=10 scrapy tests}
 install_command = {[pinned]install_command}
 setenv =
     {[pinned]setenv}