diff --git a/homeassistant/components/fritzbox/binary_sensor.py b/homeassistant/components/fritzbox/binary_sensor.py
index 75683017cb7..b8e78a9ee5c 100644
--- a/homeassistant/components/fritzbox/binary_sensor.py
+++ b/homeassistant/components/fritzbox/binary_sensor.py
@@ -22,19 +22,14 @@ from .entity import FritzBoxDeviceEntity
 from .model import FritzEntityDescriptionMixinBase
 
 
-@dataclass(frozen=True)
-class FritzEntityDescriptionMixinBinarySensor(FritzEntityDescriptionMixinBase):
-    """BinarySensor description mixin for Fritz!Smarthome entities."""
-
-    is_on: Callable[[FritzhomeDevice], bool | None]
-
-
-@dataclass(frozen=True)
+@dataclass(frozen=True, kw_only=True)
 class FritzBinarySensorEntityDescription(
-    BinarySensorEntityDescription, FritzEntityDescriptionMixinBinarySensor
+    BinarySensorEntityDescription, FritzEntityDescriptionMixinBase
 ):
     """Description for Fritz!Smarthome binary sensor entities."""
 
+    is_on: Callable[[FritzhomeDevice], bool | None]
+
 
 BINARY_SENSOR_TYPES: Final[tuple[FritzBinarySensorEntityDescription, ...]] = (
     FritzBinarySensorEntityDescription(
diff --git a/homeassistant/components/fritzbox/sensor.py b/homeassistant/components/fritzbox/sensor.py
index 801a3a67a6e..8e3ab5d6892 100644
--- a/homeassistant/components/fritzbox/sensor.py
+++ b/homeassistant/components/fritzbox/sensor.py
@@ -35,20 +35,14 @@ from .entity import FritzBoxDeviceEntity
 from .model import FritzEntityDescriptionMixinBase
 
 
-@dataclass(frozen=True)
-class FritzEntityDescriptionMixinSensor(FritzEntityDescriptionMixinBase):
-    """Sensor description mixin for Fritz!Smarthome entities."""
-
-    native_value: Callable[[FritzhomeDevice], StateType | datetime]
-
-
-@dataclass(frozen=True)
+@dataclass(frozen=True, kw_only=True)
 class FritzSensorEntityDescription(
-    SensorEntityDescription, FritzEntityDescriptionMixinSensor
+    SensorEntityDescription, FritzEntityDescriptionMixinBase
 ):
     """Description for Fritz!Smarthome sensor entities."""
 
     entity_category_fn: Callable[[FritzhomeDevice], EntityCategory | None] | None = None
+    native_value: Callable[[FritzhomeDevice], StateType | datetime]
 
 
 def suitable_eco_temperature(device: FritzhomeDevice) -> bool: