diff --git a/homeassistant/components/vilfo/sensor.py b/homeassistant/components/vilfo/sensor.py
index 34c862e1a8f..77a7df7a0a8 100644
--- a/homeassistant/components/vilfo/sensor.py
+++ b/homeassistant/components/vilfo/sensor.py
@@ -25,18 +25,13 @@ from .const import (
 )
 
 
-@dataclass(frozen=True)
-class VilfoRequiredKeysMixin:
-    """Mixin for required keys."""
+@dataclass(frozen=True, kw_only=True)
+class VilfoSensorEntityDescription(SensorEntityDescription):
+    """Describes Vilfo sensor entity."""
 
     api_key: str
 
 
-@dataclass(frozen=True)
-class VilfoSensorEntityDescription(SensorEntityDescription, VilfoRequiredKeysMixin):
-    """Describes Vilfo sensor entity."""
-
-
 SENSOR_TYPES: tuple[VilfoSensorEntityDescription, ...] = (
     VilfoSensorEntityDescription(
         key=ATTR_LOAD,