diff --git a/homeassistant/components/sfr_box/binary_sensor.py b/homeassistant/components/sfr_box/binary_sensor.py
index ca81129f699..7ddcb16c9f8 100644
--- a/homeassistant/components/sfr_box/binary_sensor.py
+++ b/homeassistant/components/sfr_box/binary_sensor.py
@@ -27,20 +27,13 @@ from .models import DomainData
 _T = TypeVar("_T")
 
 
-@dataclass(frozen=True)
-class SFRBoxBinarySensorMixin(Generic[_T]):
-    """Mixin for SFR Box sensors."""
+@dataclass(frozen=True, kw_only=True)
+class SFRBoxBinarySensorEntityDescription(BinarySensorEntityDescription, Generic[_T]):
+    """Description for SFR Box binary sensors."""
 
     value_fn: Callable[[_T], bool | None]
 
 
-@dataclass(frozen=True)
-class SFRBoxBinarySensorEntityDescription(
-    BinarySensorEntityDescription, SFRBoxBinarySensorMixin[_T]
-):
-    """Description for SFR Box binary sensors."""
-
-
 DSL_SENSOR_TYPES: tuple[SFRBoxBinarySensorEntityDescription[DslInfo], ...] = (
     SFRBoxBinarySensorEntityDescription[DslInfo](
         key="status",
diff --git a/homeassistant/components/sfr_box/button.py b/homeassistant/components/sfr_box/button.py
index 5f26bc82f1b..6dc91149d86 100644
--- a/homeassistant/components/sfr_box/button.py
+++ b/homeassistant/components/sfr_box/button.py
@@ -50,18 +50,13 @@ def with_error_wrapping(
     return wrapper
 
 
-@dataclass(frozen=True)
-class SFRBoxButtonMixin:
-    """Mixin for SFR Box buttons."""
+@dataclass(frozen=True, kw_only=True)
+class SFRBoxButtonEntityDescription(ButtonEntityDescription):
+    """Description for SFR Box buttons."""
 
     async_press: Callable[[SFRBox], Coroutine[None, None, None]]
 
 
-@dataclass(frozen=True)
-class SFRBoxButtonEntityDescription(ButtonEntityDescription, SFRBoxButtonMixin):
-    """Description for SFR Box buttons."""
-
-
 BUTTON_TYPES: tuple[SFRBoxButtonEntityDescription, ...] = (
     SFRBoxButtonEntityDescription(
         async_press=lambda x: x.system_reboot(),
diff --git a/homeassistant/components/sfr_box/sensor.py b/homeassistant/components/sfr_box/sensor.py
index 626b4181486..403ec762768 100644
--- a/homeassistant/components/sfr_box/sensor.py
+++ b/homeassistant/components/sfr_box/sensor.py
@@ -33,18 +33,13 @@ from .models import DomainData
 _T = TypeVar("_T")
 
 
-@dataclass(frozen=True)
-class SFRBoxSensorMixin(Generic[_T]):
-    """Mixin for SFR Box sensors."""
+@dataclass(frozen=True, kw_only=True)
+class SFRBoxSensorEntityDescription(SensorEntityDescription, Generic[_T]):
+    """Description for SFR Box sensors."""
 
     value_fn: Callable[[_T], StateType]
 
 
-@dataclass(frozen=True)
-class SFRBoxSensorEntityDescription(SensorEntityDescription, SFRBoxSensorMixin[_T]):
-    """Description for SFR Box sensors."""
-
-
 DSL_SENSOR_TYPES: tuple[SFRBoxSensorEntityDescription[DslInfo], ...] = (
     SFRBoxSensorEntityDescription[DslInfo](
         key="linemode",