diff --git a/tabbox/tabboxconfig.cpp b/tabbox/tabboxconfig.cpp
index 42fdbcf398..453776b751 100644
--- a/tabbox/tabboxconfig.cpp
+++ b/tabbox/tabboxconfig.cpp
@@ -91,6 +91,7 @@ TabBoxConfig& TabBoxConfig::operator=(const KWin::TabBox::TabBoxConfig& object)
     d->clientMinimizedMode = object.clientMinimizedMode();
     d->showDesktopMode = object.showDesktopMode();
     d->clientMultiScreenMode = object.clientMultiScreenMode();
+    d->clientSwitchingMode = object.clientSwitchingMode();
     d->desktopSwitchingMode = object.desktopSwitchingMode();
     d->selectedItemLayoutName = object.selectedItemLayoutName();
     d->minWidth = object.minWidth();