diff --git a/tests/test_app.py b/tests/test_app.py
index b6f4c7a..cd2236b 100644
--- a/tests/test_app.py
+++ b/tests/test_app.py
@@ -56,8 +56,7 @@ class TestAppHandler(FileTestCase):
         self.assertIs(obj, UNSPECIFIED)
 
     def test_get_appdir(self):
-
-        mockdir = self.mkdir("mockdir")
+        mockdir = self.mkdtemp()
 
         # default appdir
         with patch.object(sys, "prefix", new=mockdir):