diff --git a/lib/pushnotificationsservice.js b/lib/pushnotificationsservice.js
index a12724a..84ecc35 100644
--- a/lib/pushnotificationsservice.js
+++ b/lib/pushnotificationsservice.js
@@ -125,9 +125,10 @@ PushNotificationsService.prototype._sendPushNotifications = function(notificatio
                 "message": content.plain.body
               }
             };
+
             opts.ios = {
               "alert": content.plain.body,
-              "sound": ""
+              "sound": "default"
             };
             return next(err, opts);
           }, next);