diff --git a/homeassistant/components/plugwise/number.py b/homeassistant/components/plugwise/number.py
index 9865aec2242..2c87edddf04 100644
--- a/homeassistant/components/plugwise/number.py
+++ b/homeassistant/components/plugwise/number.py
@@ -23,19 +23,11 @@ from .coordinator import PlugwiseDataUpdateCoordinator
 from .entity import PlugwiseEntity
 
 
-@dataclass
-class PlugwiseEntityDescriptionMixin:
-    """Mixin values for Plugwise entities."""
-
-    command: Callable[[Smile, str, str, float], Awaitable[None]]
-
-
-@dataclass
-class PlugwiseNumberEntityDescription(
-    NumberEntityDescription, PlugwiseEntityDescriptionMixin
-):
+@dataclass(kw_only=True)
+class PlugwiseNumberEntityDescription(NumberEntityDescription):
     """Class describing Plugwise Number entities."""
 
+    command: Callable[[Smile, str, str, float], Awaitable[None]]
     key: NumberType
 
 
diff --git a/homeassistant/components/plugwise/select.py b/homeassistant/components/plugwise/select.py
index 138e5fe3b59..c12ca671554 100644
--- a/homeassistant/components/plugwise/select.py
+++ b/homeassistant/components/plugwise/select.py
@@ -18,21 +18,13 @@ from .coordinator import PlugwiseDataUpdateCoordinator
 from .entity import PlugwiseEntity
 
 
-@dataclass
-class PlugwiseSelectDescriptionMixin:
-    """Mixin values for Plugwise Select entities."""
-
-    command: Callable[[Smile, str, str], Awaitable[None]]
-    options_key: SelectOptionsType
-
-
-@dataclass
-class PlugwiseSelectEntityDescription(
-    SelectEntityDescription, PlugwiseSelectDescriptionMixin
-):
+@dataclass(kw_only=True)
+class PlugwiseSelectEntityDescription(SelectEntityDescription):
     """Class describing Plugwise Select entities."""
 
+    command: Callable[[Smile, str, str], Awaitable[None]]
     key: SelectType
+    options_key: SelectOptionsType
 
 
 SELECT_TYPES = (