diff --git a/mopidy/mixers/denon.py b/mopidy/mixers/denon.py
index 64d3db4d..895ae36b 100644
--- a/mopidy/mixers/denon.py
+++ b/mopidy/mixers/denon.py
@@ -11,7 +11,7 @@ class DenonMixer(BaseMixer):
     def __init__(self):
         self._device = Serial(port=MIXER_PORT, timeout=0.2)
         self._levels = ['99']+["%(#)02d"% {'#': v} for v in range(0,99)]
-        self._volume = None
+        self._volume = 0
 
     def _get_volume(self):
         self.ensure_open_device()