diff --git a/testsuite/config/__init__.py b/testsuite/config/__init__.py
index 3c13c89a..a36cc2eb 100644
--- a/testsuite/config/__init__.py
+++ b/testsuite/config/__init__.py
@@ -20,7 +20,7 @@ def __init__(self, name, default, **kwargs) -> None:
                 )
             },
             default=default,
-            when=Validator(name, must_exist=False),
+            when=Validator(name, must_exist=False) | Validator(name, eq=None),
             **kwargs
         )