diff --git a/homeassistant/components/melcloud/sensor.py b/homeassistant/components/melcloud/sensor.py
index 73a72ba9dfb..84585c556ca 100644
--- a/homeassistant/components/melcloud/sensor.py
+++ b/homeassistant/components/melcloud/sensor.py
@@ -24,21 +24,14 @@ from . import MelCloudDevice
 from .const import DOMAIN
 
 
-@dataclasses.dataclass(frozen=True)
-class MelcloudRequiredKeysMixin:
-    """Mixin for required keys."""
+@dataclasses.dataclass(frozen=True, kw_only=True)
+class MelcloudSensorEntityDescription(SensorEntityDescription):
+    """Describes Melcloud sensor entity."""
 
     value_fn: Callable[[Any], float]
     enabled: Callable[[Any], bool]
 
 
-@dataclasses.dataclass(frozen=True)
-class MelcloudSensorEntityDescription(
-    SensorEntityDescription, MelcloudRequiredKeysMixin
-):
-    """Describes Melcloud sensor entity."""
-
-
 ATA_SENSORS: tuple[MelcloudSensorEntityDescription, ...] = (
     MelcloudSensorEntityDescription(
         key="room_temperature",