diff --git a/pyproject.toml b/pyproject.toml
index d65a24d..4dee33b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -66,6 +66,12 @@ include-package-data = false
 [tool.setuptools_scm]
 write_to = "src/xdist/_version.py"
 
+[tool.pytest.ini_options]
+# pytest-services also defines a worker_id fixture, disable
+# it so they don't conflict with each other (#611).
+addopts = "-ra -p no:pytest-services"
+testpaths = ["testing"]
+
 [tool.ruff]
 src = ["src"]
 
diff --git a/tox.ini b/tox.ini
index 3092158..f583173 100644
--- a/tox.ini
+++ b/tox.ini
@@ -48,9 +48,3 @@ deps =
     sphinx_rtd_theme
 commands =
     sphinx-build -W --keep-going -b html docs docs/_build/html {posargs:}
-
-[pytest]
-# pytest-services also defines a worker_id fixture, disable
-# it so they don't conflict with each other (#611).
-addopts = -ra -p no:pytest-services
-testpaths = testing