diff --git a/xarray/namedarray/_typing.py b/xarray/namedarray/_typing.py
index 31b78034a50..e656c380584 100644
--- a/xarray/namedarray/_typing.py
+++ b/xarray/namedarray/_typing.py
@@ -34,7 +34,7 @@
 
 # Singleton type, as per https://github.com/python/typing/pull/240
 class Default(Enum):
-    __hash__ = None
+    __hash__ = None  # type: ignore[assignment] # TODO: Better way to set unhashable?
     token: Final = 0