diff --git a/mopidy/frontends/mpd/protocol/audio_output.py b/mopidy/frontends/mpd/protocol/audio_output.py
index 65e693ec..17cf4ac4 100644
--- a/mopidy/frontends/mpd/protocol/audio_output.py
+++ b/mopidy/frontends/mpd/protocol/audio_output.py
@@ -14,7 +14,7 @@ def disableoutput(context, outputid):
         Turns an output off.
     """
     if int(outputid) == 0:
-        context.core.playback.set_mute(True)
+        context.core.playback.set_mute(False)
     else:
         raise MpdNoExistError('No such audio output', command='disableoutput')
 
@@ -29,7 +29,7 @@ def enableoutput(context, outputid):
         Turns an output on.
     """
     if int(outputid) == 0:
-        context.core.playback.set_mute(False)
+        context.core.playback.set_mute(True)
     else:
         raise MpdNoExistError('No such audio output', command='enableoutput')
 
diff --git a/tests/frontends/mpd/protocol/audio_output_test.py b/tests/frontends/mpd/protocol/audio_output_test.py
index cbfb5043..4871f169 100644
--- a/tests/frontends/mpd/protocol/audio_output_test.py
+++ b/tests/frontends/mpd/protocol/audio_output_test.py
@@ -5,12 +5,12 @@ from tests.frontends.mpd import protocol
 
 class AudioOutputHandlerTest(protocol.BaseTestCase):
     def test_enableoutput(self):
-        self.core.playback.mute = True
+        self.core.playback.mute = False
 
         self.sendRequest('enableoutput "0"')
 
         self.assertInResponse('OK')
-        self.assertEqual(self.core.playback.mute.get(), False)
+        self.assertEqual(self.core.playback.mute.get(), True)
 
     def test_enableoutput_unknown_outputid(self):
         self.sendRequest('enableoutput "7"')
@@ -18,12 +18,12 @@ class AudioOutputHandlerTest(protocol.BaseTestCase):
         self.assertInResponse('ACK [50@0] {enableoutput} No such audio output')
 
     def test_disableoutput(self):
-        self.core.playback.mute = False
+        self.core.playback.mute = True
 
         self.sendRequest('disableoutput "0"')
 
         self.assertInResponse('OK')
-        self.assertEqual(self.core.playback.mute.get(), True)
+        self.assertEqual(self.core.playback.mute.get(), False)
 
     def test_disableoutput_unknown_outputid(self):
         self.sendRequest('disableoutput "7"')