diff --git a/tox.ini b/tox.ini
index 42884ba..3681a98 100644
--- a/tox.ini
+++ b/tox.ini
@@ -22,6 +22,7 @@ pass_env =
     PYTEST_*
 set_env =
     COVERAGE_FILE = {work_dir}/.coverage.{env_name}
+    TOX_USER_CONFIG_FILE = /dev/null
 commands =
     python -m pytest {tty:--color=yes} {posargs: \
       --cov {env_site_packages_dir}{/}tox_uv --cov {tox_root}{/}tests \