diff --git a/plugin-taskbar/lxqttaskbar.cpp b/plugin-taskbar/lxqttaskbar.cpp
index 4e2d3668b..a274e3eec 100644
--- a/plugin-taskbar/lxqttaskbar.cpp
+++ b/plugin-taskbar/lxqttaskbar.cpp
@@ -52,9 +52,6 @@
 
 #include "lxqttaskbarbackend_x11.h"
 
-//TODO: remove
-#include <KX11Extras>
-
 using namespace LXQt;
 
 /************************************************
@@ -108,21 +105,19 @@ LXQtTaskBar::LXQtTaskBar(ILXQtPanelPlugin *plugin, QWidget *parent) :
 
 
     // Temporary workaround
-    auto onWindowChanged_ = [this](WId window, NET::Properties prop, NET::Properties2 prop2)
+    auto onWindowChanged_ = [this](WId window, int prop)
     {
         auto i = mKnownWindows.find(window);
         if (mKnownWindows.end() != i)
         {
-            if (!(*i)->onWindowChanged(window, prop, prop2) && acceptWindow(window))
+            if (!(*i)->onWindowChanged(window, LXQtTaskBarWindowProperty(prop)))
             { // window is removed from a group because of class change, so we should add it again
                 addWindow(window);
             }
         }
     };
 
-    connect(KX11Extras::self(),
-            static_cast<void (KX11Extras::*)(WId, NET::Properties, NET::Properties2)>(&KX11Extras::windowChanged),
-            this, onWindowChanged_);
+    connect(mBackend, &ILXQtTaskbarAbstractBackend::windowPropertyChanged, this, onWindowChanged_);
 
     connect(mBackend, &ILXQtTaskbarAbstractBackend::windowAdded, this, &LXQtTaskBar::onWindowAdded);
     connect(mBackend, &ILXQtTaskbarAbstractBackend::windowRemoved, this, &LXQtTaskBar::onWindowRemoved);
diff --git a/plugin-taskbar/lxqttaskgroup.cpp b/plugin-taskbar/lxqttaskgroup.cpp
index 83c672519..bec56a190 100644
--- a/plugin-taskbar/lxqttaskgroup.cpp
+++ b/plugin-taskbar/lxqttaskgroup.cpp
@@ -617,8 +617,10 @@ void LXQtTaskGroup::wheelEvent(QWheelEvent* event)
 /************************************************
 
  ************************************************/
-bool LXQtTaskGroup::onWindowChanged(WId window, NET::Properties prop, NET::Properties2 prop2)
-{ // returns true if the class is preserved
+bool LXQtTaskGroup::onWindowChanged(WId window, LXQtTaskBarWindowProperty prop)
+{
+    // Returns true if the class is preserved
+
     bool needsRefreshVisibility{false};
     QVector<LXQtTaskButton *> buttons;
     if (mButtonHash.contains(window))
@@ -631,17 +633,16 @@ bool LXQtTaskGroup::onWindowChanged(WId window, NET::Properties prop, NET::Prope
     if (!buttons.isEmpty())
     {
         // if class is changed the window won't belong to our group any more
-        if (parentTaskBar()->isGroupingEnabled() && prop2.testFlag(NET::WM2WindowClass))
+        if (parentTaskBar()->isGroupingEnabled() && prop == LXQtTaskBarWindowProperty::WindowClass)
         {
-            KWindowInfo info(window, NET::Properties(), NET::WM2WindowClass);
-            if (QString::fromUtf8(info.windowClassClass()) != mGroupName)
+            if (mBackend->getWindowClass(windowId()) != mGroupName)
             {
                 onWindowRemoved(window);
                 return false;
             }
         }
         // window changed virtual desktop
-        if (prop.testFlag(NET::WMDesktop) || prop.testFlag(NET::WMGeometry))
+        if (prop == LXQtTaskBarWindowProperty::Workspace)
         {
             if (parentTaskBar()->isShowOnlyOneDesktopTasks()
                 || parentTaskBar()->isShowOnlyCurrentScreenTasks())
@@ -650,31 +651,28 @@ bool LXQtTaskGroup::onWindowChanged(WId window, NET::Properties prop, NET::Prope
             }
         }
 
-        if (prop.testFlag(NET::WMVisibleName) || prop.testFlag(NET::WMName))
+        if (prop == LXQtTaskBarWindowProperty::Title)
             std::for_each(buttons.begin(), buttons.end(), std::mem_fn(&LXQtTaskButton::updateText));
 
         // XXX: we are setting window icon geometry -> don't need to handle NET::WMIconGeometry
         // Icon of the button can be based on windowClass
-        if (prop.testFlag(NET::WMIcon) || prop2.testFlag(NET::WM2WindowClass))
+        if (prop == LXQtTaskBarWindowProperty::Icon)
             std::for_each(buttons.begin(), buttons.end(), std::mem_fn(&LXQtTaskButton::updateIcon));
 
         bool set_urgency = false;
         bool urgency = false;
-        if (prop2.testFlag(NET::WM2Urgency))
+        if (prop == LXQtTaskBarWindowProperty::Urgency)
         {
             set_urgency = true;
             //FIXME: original code here did not consider "demand attention", was it intentional?
             urgency = mBackend->applicationDemandsAttention(window);
         }
-        if (prop.testFlag(NET::WMState))
+        if (prop == LXQtTaskBarWindowProperty::State)
         {
-            KWindowInfo info{window, NET::WMState};
             if (!set_urgency)
                 urgency = mBackend->applicationDemandsAttention(window);
             std::for_each(buttons.begin(), buttons.end(), std::bind(&LXQtTaskButton::setUrgencyHint, std::placeholders::_1, urgency));
             set_urgency = false;
-            if (info.hasState(NET::SkipTaskbar))
-                onWindowRemoved(window);
 
             if (parentTaskBar()->isShowOnlyMinimizedTasks())
             {
diff --git a/plugin-taskbar/lxqttaskgroup.h b/plugin-taskbar/lxqttaskgroup.h
index 04cd22812..fb84aa867 100644
--- a/plugin-taskbar/lxqttaskgroup.h
+++ b/plugin-taskbar/lxqttaskgroup.h
@@ -33,7 +33,7 @@
 
 #include "lxqttaskbutton.h"
 
-#include <KF5/KWindowSystem/kwindowsystem.h>
+#include "lxqttaskbartypes.h"
 
 class QVBoxLayout;
 class ILXQtPanelPlugin;
@@ -60,7 +60,8 @@ class LXQtTaskGroup: public LXQtTaskButton
     // if circular is true, then it will go around the list of buttons
     LXQtTaskButton * getNextPrevChildButton(bool next, bool circular);
 
-    bool onWindowChanged(WId window, NET::Properties prop, NET::Properties2 prop2);
+    bool onWindowChanged(WId window, LXQtTaskBarWindowProperty prop);
+
     void setAutoRotation(bool value, ILXQtPanel::Position position);
     Qt::ToolButtonStyle popupButtonStyle() const;
     void setToolButtonsStyle(Qt::ToolButtonStyle style);