diff --git a/homeassistant/components/bluetooth/passive_update_processor.py b/homeassistant/components/bluetooth/passive_update_processor.py
index 1d1078633fe..87f7c7a9b20 100644
--- a/homeassistant/components/bluetooth/passive_update_processor.py
+++ b/homeassistant/components/bluetooth/passive_update_processor.py
@@ -116,11 +116,10 @@ def deserialize_entity_description(
 
 def serialize_entity_description(description: EntityDescription) -> dict[str, Any]:
     """Serialize an entity description."""
-    as_dict = dataclasses.asdict(description)
     return {
-        field.name: as_dict[field.name]
+        field.name: value
         for field in cached_fields(type(description))
-        if field.default != as_dict.get(field.name)
+        if (value := getattr(description, field.name)) != field.default
     }