diff --git a/custom_components/ramses_cc/binary_sensor.py b/custom_components/ramses_cc/binary_sensor.py
index 571966a..6b88610 100644
--- a/custom_components/ramses_cc/binary_sensor.py
+++ b/custom_components/ramses_cc/binary_sensor.py
@@ -110,7 +110,7 @@ def is_on(self) -> bool | None:
         return getattr(self._device, self.entity_description.ramses_rf_attr)
 
     @property
-    def icon(self) -> str:
+    def icon(self) -> str | None:
         """Return the icon to use in the frontend, if any."""
         return (
             self.entity_description.icon