diff --git a/homeassistant/components/denonavr/media_player.py b/homeassistant/components/denonavr/media_player.py
index b5990dede21..73fe0f2152d 100644
--- a/homeassistant/components/denonavr/media_player.py
+++ b/homeassistant/components/denonavr/media_player.py
@@ -338,6 +338,9 @@ class DenonDevice(MediaPlayerEntity):
 
     def select_source(self, source):
         """Select input source."""
+        # Ensure that the AVR is turned on, which is necessary for input
+        # switch to work.
+        self.turn_on()
         return self._receiver.set_input_func(source)
 
     def select_sound_mode(self, sound_mode):