diff --git a/homeassistant/components/isy994/binary_sensor.py b/homeassistant/components/isy994/binary_sensor.py
index 27f1887bd92..7be3b87a0d3 100644
--- a/homeassistant/components/isy994/binary_sensor.py
+++ b/homeassistant/components/isy994/binary_sensor.py
@@ -249,7 +249,8 @@ class ISYBinarySensorEntity(ISYNodeEntity, BinarySensorEntity):
     ) -> None:
         """Initialize the ISY binary sensor device."""
         super().__init__(node, device_info=device_info)
-        self._device_class = force_device_class
+        # This was discovered by parsing the device type code during init
+        self._attr_device_class = force_device_class
 
     @property
     def is_on(self) -> bool | None:
@@ -258,14 +259,6 @@ class ISYBinarySensorEntity(ISYNodeEntity, BinarySensorEntity):
             return None
         return bool(self._node.status)
 
-    @property
-    def device_class(self) -> BinarySensorDeviceClass | None:
-        """Return the class of this device.
-
-        This was discovered by parsing the device type code during init
-        """
-        return self._device_class
-
 
 class ISYInsteonBinarySensorEntity(ISYBinarySensorEntity):
     """Representation of an ISY Insteon binary sensor device.