diff --git a/tox.ini b/tox.ini
index 18b0e7a4..69281e30 100644
--- a/tox.ini
+++ b/tox.ini
@@ -28,7 +28,7 @@ commands =
 filterwarnings =
     default::DeprecationWarning
     error:.*:Warning:pelican
-addopts = -n 2 -r a
+addopts = -n auto -r a
 
 [flake8]
 application-import-names = pelican