diff --git a/mopidy_musicbox_webclient/static/index.html b/mopidy_musicbox_webclient/static/index.html
index e81d231..593fb74 100644
--- a/mopidy_musicbox_webclient/static/index.html
+++ b/mopidy_musicbox_webclient/static/index.html
@@ -117,7 +117,7 @@
         </li>
         <li id="" data-icon="false">
             <div><!-- slider for volume -->
-                <a href="#" onclick="doMute(); return false;"><span title="Toggle mute"><i id="mutebt" class="fa fa-volume-off"></i></span></a>
+                <a href="#" onclick="toggleMute(); return false;"><span title="Toggle mute"><i id="mutebt" class="fa fa-volume-off"></i></span></a>
                 <label for="volumeslider" class="ui-hidden-accessible">Volume</label>
                 <input id="volumeslider" data-highlight="true" name="volumeslider" data-mini="true" type="range" min="0"
                        value="0" max="100" onchange="doVolume(this.value);"/>
diff --git a/mopidy_musicbox_webclient/static/js/controls.js b/mopidy_musicbox_webclient/static/js/controls.js
index 42dc5f9..d1b6c7b 100644
--- a/mopidy_musicbox_webclient/static/js/controls.js
+++ b/mopidy_musicbox_webclient/static/js/controls.js
@@ -420,13 +420,13 @@ function doVolume(value) {
 }
 
 function triggerVolume() {
-    mopidy.playback.setVolume(parseInt(volumeChanging)).then();
+    mopidy.playback.setVolume(parseInt(volumeChanging));
     volumeChanging = 0;
 }
 
-function doMute() {
+function toggleMute() {
     mopidy.mixer.getMute().then(function(mute) {
-        mopidy.mixer.setMute(!mute).then();
+        mopidy.mixer.setMute(!mute);
         if (!mute) {
             $("#mutebt").attr('class', 'fa fa-volume-up');
         } else {