diff --git a/tox.ini b/tox.ini
index 2d676029..beae6956 100644
--- a/tox.ini
+++ b/tox.ini
@@ -60,7 +60,7 @@ commands =
 # it doesn't get run in CI
 envdir = {toxworkdir}/py3
 commands =
-    pytest --tb native -s {posargs:-m 'serial'}
+    pytest --tb native {posargs:-m 'serial'}
 
 [testenv:validate]
 envdir = {toxworkdir}/validate