diff --git a/tox.ini b/tox.ini
index 3640ae7..364e582 100644
--- a/tox.ini
+++ b/tox.ini
@@ -11,6 +11,8 @@ usedevelop = True
 changedir = tests
 deps =
     -r{toxinidir}/tests/requirements.txt
+setenv =
+    py38: PYTEST_ADDOPTS = -p no:xdist
 commands =
     playwright install chromium
     playwright install-deps chromium firefox