diff --git a/kate/kateconfigdialog.h b/kate/kateconfigdialog.h
--- a/kate/kateconfigdialog.h
+++ b/kate/kateconfigdialog.h
@@ -22,6 +22,8 @@
 #ifndef __kate_configdialog_h__
 #define __kate_configdialog_h__
 
+#include <QCloseEvent>
+
 #include <KTextEditor/Plugin>
 #include <KTextEditor/ConfigPage>
 #include <KTextEditor/Editor>
@@ -67,18 +69,23 @@
     void addPluginPage(KTextEditor::Plugin *plugin);
     void removePluginPage(KTextEditor::Plugin *plugin);
     void showAppPluginPage(KTextEditor::Plugin *plugin, uint id);
+    
 protected Q_SLOTS:
     void slotApply();
     void slotChanged();
     void slotHelp();
 
     void slotCurrentPageChanged(KPageWidgetItem *current, KPageWidgetItem *before);
 
+protected:
+    void closeEvent(QCloseEvent *event) override;
+    
 private:
     KateMainWindow *m_mainWindow;
 
     KTextEditor::View *m_view;
     bool m_dataChanged;
+    bool m_unsavedChange;
 
     QCheckBox *m_modNotifications;
     QCheckBox *m_modCloseAfterLast;
diff --git a/kate/kateconfigdialog.cpp b/kate/kateconfigdialog.cpp
--- a/kate/kateconfigdialog.cpp
+++ b/kate/kateconfigdialog.cpp
@@ -36,6 +36,7 @@
 
 #include <KStandardAction>
 #include <KLocalizedString>
+#include <KMessageBox>
 #include <KConfigGroup>
 #include <KSharedConfig>
 #include <KPluralHandlingSpinBox>
@@ -53,6 +54,7 @@
     : KPageDialog(parent)
     , m_mainWindow(parent)
     , m_view(view)
+    , m_unsavedChange(false)
 {
     setFaceType(Tree);
     setWindowTitle(i18n("Configure"));
@@ -386,11 +388,13 @@
 
     m_dataChanged = false;
     buttonBox()->button(QDialogButtonBox::Apply)->setEnabled(false);
+    m_unsavedChange = true;
 }
 
 void KateConfigDialog::slotChanged()
 {
     m_dataChanged = true;
+    m_unsavedChange = true;
     buttonBox()->button(QDialogButtonBox::Apply)->setEnabled(true);
 }
 
@@ -415,3 +419,30 @@
     return maxItems;
 }
 
+void KateConfigDialog::closeEvent(QCloseEvent* event)
+{
+    if (!m_unsavedChange) {
+        event->accept();
+        return;
+    }
+
+    const auto response = KMessageBox::warningYesNoCancel(this,
+                                        i18n("You have have unsaved changes. Do you want to apply the changes or discard them?"),
+                                        i18n("Warning"),
+                                        KStandardGuiItem::save(),
+                                        KStandardGuiItem::discard(),
+                                        KStandardGuiItem::cancel());
+    switch (response) {
+        case KMessageBox::Yes:
+            slotApply();
+            Q_FALLTHROUGH();
+        case KMessageBox::No:
+            event->accept();
+            break;
+        case KMessageBox::Cancel:
+            event->ignore();
+            break;
+        default:
+            break;
+    }
+}