diff --git a/tests/unit/provision/mrack/test_hw.py b/tests/unit/provision/mrack/test_hw.py
index e11b804623..4b20dc847a 100644
--- a/tests/unit/provision/mrack/test_hw.py
+++ b/tests/unit/provision/mrack/test_hw.py
@@ -133,6 +133,18 @@ def test_maximal_constraint(root_logger: Logger) -> None:
                                 }
                             }
                         },
+                    {
+                        'not': [
+                            {
+                                'cpu': {
+                                    'model_name': {
+                                        '_op': 'like',
+                                        '_value': 'Haswell%'
+                                        }
+                                    }
+                                },
+                            ]
+                        },
                     {'or': []},
                     {'or': []},
                     {'or': []},