diff --git a/src/mibew/js/source/default/utils.js b/src/mibew/js/source/default/utils.js
index c2b7d120..79d186a7 100644
--- a/src/mibew/js/source/default/utils.js
+++ b/src/mibew/js/source/default/utils.js
@@ -102,7 +102,7 @@
     };
 
     /**
-     * Play .wav or .mp3 sound file
+     * Play .wav, or .mp3, or .ogg sound file
      * @param {String} file File path (without extension)
      */
     Mibew.Utils.playSound = function (file) {
@@ -114,6 +114,7 @@
             var audioTag = $("<audio>", {autoplay: true, style: "display: none"}).append(
             '<source src="' + file + '.wav" type="audio/x-wav" />' +
             '<source src="' + file + '.mp3" type="audio/mpeg" codecs="mp3" />' +
+            '<source src="' + file + '.ogg" type="audio/ogg" codecs="vorbis" />' +
             '<embed src="' + file + '.wav" type="audio/x-wav" hidden="true" autostart="true" loop="false" />'
             );
             $('body').append(audioTag);
diff --git a/src/mibew/js/source/widget.js b/src/mibew/js/source/widget.js
index 2755a6f8..211b8e28 100644
--- a/src/mibew/js/source/widget.js
+++ b/src/mibew/js/source/widget.js
@@ -393,7 +393,8 @@ var Mibew = Mibew || {};
                 sound.setAttribute('id', 'mibew-notification-sound');
                 sound.setAttribute('style', 'display: none;');
                 sound.innerHTML = '<source src="' + soundFile + '.wav" type="audio/x-wav" />'
-                                + '<source src="' + soundFile + '.mp3" type="audio/mpeg" codecs="mp3" />';
+                                + '<source src="' + soundFile + '.mp3" type="audio/mpeg" codecs="mp3" />'
+                                + '<source src="' + soundFile + '.ogg" type="audio/ogg" codecs="vorbis" />';
                 document.getElementsByTagName('body')[0].appendChild(sound);
             }
             // User should do something on a page before it could be possible to play sound, so just try
diff --git a/src/mibew/sounds/invite.ogg b/src/mibew/sounds/invite.ogg
new file mode 100644
index 00000000..872aa483
Binary files /dev/null and b/src/mibew/sounds/invite.ogg differ
diff --git a/src/mibew/sounds/new_message.ogg b/src/mibew/sounds/new_message.ogg
new file mode 100644
index 00000000..cdcf6032
Binary files /dev/null and b/src/mibew/sounds/new_message.ogg differ
diff --git a/src/mibew/sounds/new_user.ogg b/src/mibew/sounds/new_user.ogg
new file mode 100644
index 00000000..872aa483
Binary files /dev/null and b/src/mibew/sounds/new_user.ogg differ