diff --git a/pkgs/clan-cli/pyproject.toml b/pkgs/clan-cli/pyproject.toml
index 127d6cfc6..1c16c93a1 100644
--- a/pkgs/clan-cli/pyproject.toml
+++ b/pkgs/clan-cli/pyproject.toml
@@ -18,6 +18,7 @@ clan_cli = [ "config/jsonschema/*", "webui/assets/**/*"]
 faulthandler_timeout = 30
 addopts = "--cov . --cov-report term --cov-report html:.reports/html --no-cov-on-fail --workers auto --durations 5"
 norecursedirs = "tests/helpers"
+markers = [ "impure" ]
 
 [tool.mypy]
 python_version = "3.10"