diff --git a/tests/unit/test_collector.py b/tests/unit/test_collector.py
index 381cde6eaa8..e49c47c54b2 100644
--- a/tests/unit/test_collector.py
+++ b/tests/unit/test_collector.py
@@ -202,6 +202,7 @@ def test_get_simple_response_no_head(
             },
         ),
         mock.call().headers.get("Content-Type", "Unknown"),
+        mock.call().headers.get("Content-Type", "Unknown"),
     ]
     mock_raise_for_status.assert_called_once_with(resp)