diff --git a/lib/pushnotificationsservice.js b/lib/pushnotificationsservice.js
index a12724a..335c0ba 100644
--- a/lib/pushnotificationsservice.js
+++ b/lib/pushnotificationsservice.js
@@ -127,7 +127,7 @@ PushNotificationsService.prototype._sendPushNotifications = function(notificatio
             };
             opts.ios = {
               "alert": content.plain.body,
-              "sound": ""
+              "sound": "default"
             };
             return next(err, opts);
           }, next);