diff --git a/js/ui/keyboard.js b/js/ui/keyboard.js
index ac249dfea..008253e0d 100644
--- a/js/ui/keyboard.js
+++ b/js/ui/keyboard.js
@@ -438,7 +438,6 @@ const Keyboard = new Lang.Class({
     _createSource: function () {
         if (this._source == null) {
             this._source = new KeyboardSource(this);
-            this._source.setTransient(true);
             Main.messageTray.add(this._source);
         }
     },
diff --git a/js/ui/messageTray.js b/js/ui/messageTray.js
index 4372c36f1..daafcc2fa 100644
--- a/js/ui/messageTray.js
+++ b/js/ui/messageTray.js
@@ -1263,7 +1263,6 @@ const Source = new Lang.Class({
         this.title = title;
         this.iconName = iconName;
 
-        this.isTransient = false;
         this.isChat = false;
         this.isMuted = false;
         this.keepTrayOnSummaryClick = false;
@@ -1323,10 +1322,6 @@ const Source = new Lang.Class({
         return rightClickMenu;
     },
 
-    setTransient: function(isTransient) {
-        this.isTransient = isTransient;
-    },
-
     setTitle: function(newTitle) {
         this.title = newTitle;
         this.emit('title-changed');
@@ -2914,8 +2909,6 @@ const MessageTray = new Lang.Class({
             this._summaryBoxPointerItem.doneShowingNotificationStack();
             this._summaryBoxPointerItem = null;
 
-            if (source.isTransient && !this._reNotifyAfterHideNotification)
-                source.destroy(NotificationDestroyedReason.EXPIRED);
             if (this._reNotifyAfterHideNotification) {
                 this._onNotify(this._reNotifyAfterHideNotification.source, this._reNotifyAfterHideNotification);
                 this._reNotifyAfterHideNotification = null;
@@ -2934,7 +2927,6 @@ const SystemNotificationSource = new Lang.Class({
 
     _init: function() {
         this.parent(_("System Information"), 'dialog-information-symbolic');
-        this.setTransient(true);
     },
 
     open: function() {
diff --git a/js/ui/notificationDaemon.js b/js/ui/notificationDaemon.js
index 214315cc1..d6f983d0c 100644
--- a/js/ui/notificationDaemon.js
+++ b/js/ui/notificationDaemon.js
@@ -181,12 +181,10 @@ const FdoNotificationDaemon = new Lang.Class({
     },
 
     // Returns the source associated with ndata.notification if it is set.
-    // Otherwise, returns the source associated with the title and pid if
-    // such source is stored in this._sources and the notification is not
-    // transient. If the existing or requested source is associated with
-    // a tray icon and passed in pid matches a pid of an existing source,
-    // the title match is ignored to enable representing a tray icon and
-    // notifications from the same application with a single source.
+    // If the existing or requested source is associated with a tray icon
+    // and passed in pid matches a pid of an existing source, the title
+    // match is ignored to enable representing a tray icon and notifications
+    // from the same application with a single source.
     //
     // If no existing source is found, a new source is created as long as
     // pid is provided.
@@ -204,32 +202,20 @@ const FdoNotificationDaemon = new Lang.Class({
         if (ndata && ndata.notification)
             return ndata.notification.source;
 
-        let isForTransientNotification = (ndata && ndata.hints['transient'] == true);
-
-        // We don't want to override a persistent notification
-        // with a transient one from the same sender, so we
-        // always create a new source object for new transient notifications
-        // and never add it to this._sources .
-        if (!isForTransientNotification) {
-            let source = this._lookupSource(title, pid, trayIcon);
-            if (source) {
-                source.setTitle(title);
-                return source;
-            }
+        let source = this._lookupSource(title, pid, trayIcon);
+        if (source) {
+            source.setTitle(title);
+            return source;
         }
 
         let source = new FdoNotificationDaemonSource(title, pid, sender, trayIcon, ndata ? ndata.hints['desktop-entry'] : null);
-        source.setTransient(isForTransientNotification);
 
-        if (!isForTransientNotification) {
-            this._sources.push(source);
-            source.connect('destroy', Lang.bind(this,
-                function() {
-                    let index = this._sources.indexOf(source);
-                    if (index >= 0)
-                        this._sources.splice(index, 1);
-                }));
-        }
+        this._sources.push(source);
+        source.connect('destroy', Lang.bind(this, function() {
+            let index = this._sources.indexOf(source);
+            if (index >= 0)
+                this._sources.splice(index, 1);
+        }));
 
         Main.messageTray.add(source);
         return source;
@@ -336,20 +322,10 @@ const FdoNotificationDaemon = new Lang.Class({
             let [pid] = result;
             source = this._getSource(appName, pid, ndata, sender, null);
 
-            // We only store sender-pid entries for persistent sources.
-            // Removing the entries once the source is destroyed
-            // would result in the entries associated with transient
-            // sources removed once the notification is shown anyway.
-            // However, keeping these pairs would mean that we would
-            // possibly remove an entry associated with a persistent
-            // source when a transient source for the same sender is
-            // distroyed.
-            if (!source.isTransient) {
-                this._senderToPid[sender] = pid;
-                source.connect('destroy', Lang.bind(this, function() {
-                    delete this._senderToPid[sender];
-                }));
-            }
+            this._senderToPid[sender] = pid;
+            source.connect('destroy', Lang.bind(this, function() {
+                delete this._senderToPid[sender];
+            }));
             this._notifyForSource(source, ndata);
         }));
 
diff --git a/js/ui/overviewControls.js b/js/ui/overviewControls.js
index cfe89a54a..ade0f191f 100644
--- a/js/ui/overviewControls.js
+++ b/js/ui/overviewControls.js
@@ -460,9 +460,6 @@ const MessagesIndicator = new Lang.Class({
         if (source.trayIcon)
             return;
 
-        if (source.isTransient)
-            return;
-
         source.connect('count-updated', Lang.bind(this, this._updateCount));
         this._sources.push(source);
         this._updateCount();
diff --git a/js/ui/screenShield.js b/js/ui/screenShield.js
index bef8131e4..9d00b6adf 100644
--- a/js/ui/screenShield.js
+++ b/js/ui/screenShield.js
@@ -240,10 +240,6 @@ const NotificationsBox = new Lang.Class({
     },
 
     _sourceAdded: function(tray, source, initial) {
-        // Ignore transient sources
-        if (source.isTransient)
-            return;
-
         let obj = {
             visible: source.policy.showInLockScreen,
             detailed: source.policy.detailsInLockScreen,