diff --git a/kconf_update/CMakeLists.txt b/kconf_update/CMakeLists.txt
index 6ed0f50578..54bab696bb 100644
--- a/kconf_update/CMakeLists.txt
+++ b/kconf_update/CMakeLists.txt
@@ -11,5 +11,10 @@ target_sources(kwin-6.0-reset-active-mouse-screen PRIVATE kwin-6.0-reset-active-
 target_link_libraries(kwin-6.0-reset-active-mouse-screen PRIVATE KF6::ConfigCore)
 install(TARGETS kwin-6.0-reset-active-mouse-screen DESTINATION ${KDE_INSTALL_LIBDIR}/kconf_update_bin/)
 
+add_executable(kwin-6.0-remove-breeze-tabbox-default)
+target_sources(kwin-6.0-remove-breeze-tabbox-default PRIVATE kwin-6.0-remove-breeze-tabbox-default.cpp)
+target_link_libraries(kwin-6.0-remove-breeze-tabbox-default PRIVATE KF6::ConfigCore)
+install(TARGETS kwin-6.0-remove-breeze-tabbox-default DESTINATION ${KDE_INSTALL_LIBDIR}/kconf_update_bin/)
+
 install(FILES kwin.upd
         DESTINATION ${KDE_INSTALL_KCONFUPDATEDIR})
diff --git a/kconf_update/kwin-6.0-remove-breeze-tabbox-default.cpp b/kconf_update/kwin-6.0-remove-breeze-tabbox-default.cpp
new file mode 100644
index 0000000000..dd536ab0b3
--- /dev/null
+++ b/kconf_update/kwin-6.0-remove-breeze-tabbox-default.cpp
@@ -0,0 +1,40 @@
+/*
+    SPDX-FileCopyrightText: 2024 Vlad Zahorodnii <vlad.zahorodnii@kde.org>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
+
+#include <KConfigGroup>
+#include <KSharedConfig>
+
+int main()
+{
+    KConfig config(QStandardPaths::writableLocation(QStandardPaths::GenericConfigLocation) + QLatin1String("/kdedefaults/kwinrc"), KConfig::SimpleConfig);
+
+    KConfigGroup windows = config.group(QStringLiteral("TabBox"));
+    bool needsSync = false;
+
+    if (!windows.exists()) {
+        return EXIT_SUCCESS;
+    }
+
+    if (windows.hasKey(QStringLiteral("LayoutName")) && windows.readEntry(QStringLiteral("LayoutName"), QString()) == QString("org.kde.breeze.desktop")) {
+        windows.deleteEntry(QStringLiteral("LayoutName"));
+        needsSync = true;
+    }
+
+    if (windows.hasKey(QStringLiteral("DesktopListLayout"))) {
+        windows.deleteEntry(QStringLiteral("DesktopListLayout"));
+        needsSync = true;
+    }
+    if (windows.hasKey(QStringLiteral("DesktopLayout"))) {
+        windows.deleteEntry(QStringLiteral("DesktopLayout"));
+        needsSync = true;
+    }
+
+    if (needsSync) {
+        return windows.sync() ? EXIT_SUCCESS : EXIT_FAILURE;
+    } else {
+        return EXIT_SUCCESS;
+    }
+}
diff --git a/kconf_update/kwin.upd b/kconf_update/kwin.upd
index e620aef65e..8b4e3d1803 100644
--- a/kconf_update/kwin.upd
+++ b/kconf_update/kwin.upd
@@ -10,3 +10,7 @@ Script=kwin-6.0-reset-active-mouse-screen
 # Delete old desktop switching shortcuts.
 Id=kwin-6.0-delete-desktop-switching-shortcuts
 Script=kwin-6.0-delete-desktop-switching-shortcuts
+
+# Delete old tabbox defaults
+Id=kwin-6.0-remove-breeze-tabbox-default
+Script=kwin-6.0-remove-breeze-tabbox-default