diff --git a/chatmaild/src/chatmaild/tests/test_config.py b/chatmaild/src/chatmaild/tests/test_config.py
index fdc308b4..b651524e 100644
--- a/chatmaild/src/chatmaild/tests/test_config.py
+++ b/chatmaild/src/chatmaild/tests/test_config.py
@@ -24,7 +24,7 @@ def test_read_config_testrun(make_config):
     assert config.postfix_reinject_port == 10025
     assert config.max_user_send_per_minute == 60
     assert config.max_mailbox_size == "100M"
-    assert config.delete_mails_after == "40"
+    assert config.delete_mails_after == "20"
     assert config.username_min_length == 9
     assert config.username_max_length == 9
     assert config.password_min_length == 9