diff --git a/pkgs/clan-cli/default.nix b/pkgs/clan-cli/default.nix
index 221f1e271..1badd227b 100644
--- a/pkgs/clan-cli/default.nix
+++ b/pkgs/clan-cli/default.nix
@@ -65,8 +65,7 @@ let
     cp -r ${src} ./src
     chmod +w -R ./src
     cd src
-    find .
-    ${checkPython}/bin/pytest
+    ${checkPython}/bin/python -m pytest ./tests
     touch $out
   '';
 
diff --git a/pkgs/clan-cli/tests/test_cli.py b/pkgs/clan-cli/tests/test_cli.py
index a02c03933..3c61bee0b 100644
--- a/pkgs/clan-cli/tests/test_cli.py
+++ b/pkgs/clan-cli/tests/test_cli.py
@@ -4,7 +4,7 @@ import clan_cli
 import pytest
 
 
-def test_no_args(capsys):
+def test_no_args(capsys: pytest.CaptureFixture) -> None:
     clan_cli.main()
     captured = capsys.readouterr()
     assert captured.out.startswith("usage:")