diff --git a/js/ui/messageTray.js b/js/ui/messageTray.js
index 84681569e..f8e2f0b9f 100644
--- a/js/ui/messageTray.js
+++ b/js/ui/messageTray.js
@@ -50,12 +50,15 @@ var State = {
 // These reasons are useful when we destroy the notifications received through
 // the notification daemon. We use EXPIRED for notifications that we dismiss
 // and the user did not interact with, DISMISSED for all other notifications
-// that were destroyed as a result of a user action, and SOURCE_CLOSED for the
-// notifications that were requested to be destroyed by the associated source.
+// that were destroyed as a result of a user action, SOURCE_CLOSED for the
+// notifications that were requested to be destroyed by the associated source,
+// and REPLACED for notifications that were destroyed as a consequence of a
+// newer version having replaced them.
 var NotificationDestroyedReason = {
     EXPIRED: 1,
     DISMISSED: 2,
-    SOURCE_CLOSED: 3
+    SOURCE_CLOSED: 3,
+    REPLACED: 4
 };
 
 // Message tray has its custom Urgency enumeration. LOW, NORMAL and CRITICAL
diff --git a/js/ui/notificationDaemon.js b/js/ui/notificationDaemon.js
index 4d2be44ed..609e56253 100644
--- a/js/ui/notificationDaemon.js
+++ b/js/ui/notificationDaemon.js
@@ -690,7 +690,7 @@ var GtkNotificationDaemonAppSource = new Lang.Class({
         this._notificationPending = true;
 
         if (this._notifications[notificationId])
-            this._notifications[notificationId].destroy();
+            this._notifications[notificationId].destroy(MessageTray.NotificationDestroyedReason.REPLACED);
 
         let notification = this._createNotification(notificationParams);
         notification.connect('destroy', () => {