diff --git a/.isort.cfg b/.isort.cfg
deleted file mode 100644
index 5ab55dc..0000000
--- a/.isort.cfg
+++ /dev/null
@@ -1,3 +0,0 @@
-[settings]
-known_standard_library=posixpath
-known_third_party=gunicorn,passlib,pkg_resources,pytest,pytest_cov,vobject
diff --git a/setup.cfg b/setup.cfg
index ee99fdb..ecac93d 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -7,3 +7,7 @@ python-tag = py3
 [tool:pytest]
 addopts = --flake8 --isort --cov -r s
 norecursedirs = dist .cache .git build Radicale.egg-info .eggs venv
+
+[isort]
+known_standard_library=posixpath
+known_third_party=gunicorn,passlib,pkg_resources,pytest,pytest_cov,vobject