diff --git a/homeassistant/components/mill/climate.py b/homeassistant/components/mill/climate.py
index f78133d8e5b..8a7fc77ea31 100644
--- a/homeassistant/components/mill/climate.py
+++ b/homeassistant/components/mill/climate.py
@@ -205,8 +205,7 @@ class LocalMillHeater(CoordinatorEntity, ClimateEntity):
         """Initialize the thermostat."""
         super().__init__(coordinator)
         self._attr_name = coordinator.mill_data_connection.name
-        if coordinator.mill_data_connection.mac_address:
-            mac = self.coordinator.mill_data_connection.mac_address
+        if mac := coordinator.mill_data_connection.mac_address:
             self._attr_unique_id = mac
             self._attr_device_info = DeviceInfo(
                 connections={(CONNECTION_NETWORK_MAC, mac)},
diff --git a/homeassistant/components/mill/sensor.py b/homeassistant/components/mill/sensor.py
index 5925650ed65..376ef33f987 100644
--- a/homeassistant/components/mill/sensor.py
+++ b/homeassistant/components/mill/sensor.py
@@ -203,8 +203,7 @@ class LocalMillSensor(CoordinatorEntity, SensorEntity):
         self._attr_name = (
             f"{coordinator.mill_data_connection.name} {entity_description.name}"
         )
-        if coordinator.mill_data_connection.mac_address:
-            mac = self.coordinator.mill_data_connection.mac_address
+        if mac := coordinator.mill_data_connection.mac_address:
             self._attr_unique_id = f"{mac}_{entity_description.key}"
             self._attr_device_info = DeviceInfo(
                 connections={(CONNECTION_NETWORK_MAC, mac)},