diff --git a/tests/api/test_common.py b/tests/api/test_common.py
index 441be77..2dde937 100644
--- a/tests/api/test_common.py
+++ b/tests/api/test_common.py
@@ -90,7 +90,7 @@ def test_login_logout_Success(session, credentials):
     assert "DelecoToken" not in session.headers
 
     session.set_credentials(
-        user_name=credentials["user"],
+        username=credentials["user"],
         password="WRONG_PASSWORD",
         database=credentials["db"],
         mandant=credentials["mandant"],