diff --git a/panels/dock/taskmanager/x11window.cpp b/panels/dock/taskmanager/x11window.cpp
index fa4e9d1a1..adddaf363 100644
--- a/panels/dock/taskmanager/x11window.cpp
+++ b/panels/dock/taskmanager/x11window.cpp
@@ -5,6 +5,7 @@
 #include "x11window.h"
 #include "abstractwindow.h"
 #include "x11utils.h"
+#include "appitem.h"
 
 #include <mutex>
 
@@ -48,6 +49,11 @@ QStringList X11Window::identity()
 {
     if (m_identity.isEmpty()) {
         m_identity = X11->getWindowWMClass(m_windowID);
+        if (auto appItem = getAppItem()) {
+            m_identity.append(appItem->desktopfileID());
+        } else {
+            qCWarning(x11windowLog) << "identify not found appitem." << id();
+        }
         m_identity.append(QString::number(pid()));
     }
 
diff --git a/panels/dock/taskmanager/x11windowmonitor.cpp b/panels/dock/taskmanager/x11windowmonitor.cpp
index 4ecaa442d..f3451a610 100644
--- a/panels/dock/taskmanager/x11windowmonitor.cpp
+++ b/panels/dock/taskmanager/x11windowmonitor.cpp
@@ -175,8 +175,9 @@ void X11WindowMonitor::onWindowMapped(xcb_window_t xcb_window)
 
     uint32_t value_list[] = { XCB_EVENT_MASK_PROPERTY_CHANGE | XCB_EVENT_MASK_STRUCTURE_NOTIFY | XCB_EVENT_MASK_VISIBILITY_CHANGE};
     xcb_change_window_attributes(X11->getXcbConnection(), xcb_window, XCB_CW_EVENT_MASK, value_list);
-    trackWindow(window.get());
     Q_EMIT AbstractWindowMonitor::windowAdded(static_cast<QPointer<AbstractWindow>>(window.get()));
+    trackWindow(window.get());
+
 }
 
 void X11WindowMonitor::onWindowDestroyed(xcb_window_t xcb_window)