diff --git a/homeassistant/components/mediaroom/media_player.py b/homeassistant/components/mediaroom/media_player.py
index b5089c64b14..09e137c96d1 100644
--- a/homeassistant/components/mediaroom/media_player.py
+++ b/homeassistant/components/mediaroom/media_player.py
@@ -142,7 +142,7 @@ class MediaroomDevice(MediaPlayerEntity):
             State.UNKNOWN: None,
         }
 
-        self._state = state_map[mediaroom_state]
+        self._attr_state = state_map[mediaroom_state]
 
     def __init__(self, host, device_id, optimistic=False, timeout=DEFAULT_TIMEOUT):
         """Initialize the device."""
@@ -154,7 +154,7 @@ class MediaroomDevice(MediaPlayerEntity):
         )
         self._channel = None
         self._optimistic = optimistic
-        self._state = (
+        self._attr_state = (
             MediaPlayerState.PLAYING if optimistic else MediaPlayerState.STANDBY
         )
         self._name = f"Mediaroom {device_id if device_id else host}"
@@ -179,7 +179,7 @@ class MediaroomDevice(MediaPlayerEntity):
             if not stb_state:
                 return
             self.set_state(stb_state)
-            _LOGGER.debug("STB(%s) is [%s]", self.host, self._state)
+            _LOGGER.debug("STB(%s) is [%s]", self.host, self.state)
             self._available = True
             self.async_write_ha_state()
 
@@ -215,7 +215,7 @@ class MediaroomDevice(MediaPlayerEntity):
         try:
             await self.stb.send_cmd(command)
             if self._optimistic:
-                self._state = MediaPlayerState.PLAYING
+                self._attr_state = MediaPlayerState.PLAYING
             self._available = True
         except PyMediaroomError:
             self._available = False
@@ -231,11 +231,6 @@ class MediaroomDevice(MediaPlayerEntity):
         """Return the name of the device."""
         return self._name
 
-    @property
-    def state(self):
-        """Return the state of the device."""
-        return self._state
-
     @property
     def media_channel(self):
         """Channel currently playing."""
@@ -247,7 +242,7 @@ class MediaroomDevice(MediaPlayerEntity):
         try:
             self.set_state(await self.stb.turn_on())
             if self._optimistic:
-                self._state = MediaPlayerState.PLAYING
+                self._attr_state = MediaPlayerState.PLAYING
             self._available = True
         except PyMediaroomError:
             self._available = False
@@ -259,7 +254,7 @@ class MediaroomDevice(MediaPlayerEntity):
         try:
             self.set_state(await self.stb.turn_off())
             if self._optimistic:
-                self._state = MediaPlayerState.STANDBY
+                self._attr_state = MediaPlayerState.STANDBY
             self._available = True
         except PyMediaroomError:
             self._available = False
@@ -272,7 +267,7 @@ class MediaroomDevice(MediaPlayerEntity):
             _LOGGER.debug("media_play()")
             await self.stb.send_cmd("PlayPause")
             if self._optimistic:
-                self._state = MediaPlayerState.PLAYING
+                self._attr_state = MediaPlayerState.PLAYING
             self._available = True
         except PyMediaroomError:
             self._available = False
@@ -284,7 +279,7 @@ class MediaroomDevice(MediaPlayerEntity):
         try:
             await self.stb.send_cmd("PlayPause")
             if self._optimistic:
-                self._state = MediaPlayerState.PAUSED
+                self._attr_state = MediaPlayerState.PAUSED
             self._available = True
         except PyMediaroomError:
             self._available = False
@@ -296,7 +291,7 @@ class MediaroomDevice(MediaPlayerEntity):
         try:
             await self.stb.send_cmd("Stop")
             if self._optimistic:
-                self._state = MediaPlayerState.PAUSED
+                self._attr_state = MediaPlayerState.PAUSED
             self._available = True
         except PyMediaroomError:
             self._available = False
@@ -308,7 +303,7 @@ class MediaroomDevice(MediaPlayerEntity):
         try:
             await self.stb.send_cmd("ProgDown")
             if self._optimistic:
-                self._state = MediaPlayerState.PLAYING
+                self._attr_state = MediaPlayerState.PLAYING
             self._available = True
         except PyMediaroomError:
             self._available = False
@@ -320,7 +315,7 @@ class MediaroomDevice(MediaPlayerEntity):
         try:
             await self.stb.send_cmd("ProgUp")
             if self._optimistic:
-                self._state = MediaPlayerState.PLAYING
+                self._attr_state = MediaPlayerState.PLAYING
             self._available = True
         except PyMediaroomError:
             self._available = False