diff --git a/homeassistant/components/netatmo/netatmo_entity_base.py b/homeassistant/components/netatmo/netatmo_entity_base.py
index c434d370e27..78352e486e0 100644
--- a/homeassistant/components/netatmo/netatmo_entity_base.py
+++ b/homeassistant/components/netatmo/netatmo_entity_base.py
@@ -29,7 +29,7 @@ class NetatmoBase(Entity):
         self._device_name: str = ""
         self._id: str = ""
         self._model: str = ""
-        self._config_url: str = ""
+        self._config_url: str | None = None
         self._attr_name = None
         self._attr_unique_id = None
         self._attr_extra_state_attributes = {}