diff --git a/kcmkwin/kwindecoration/declarative-plugin/previewitem.cpp b/kcmkwin/kwindecoration/declarative-plugin/previewitem.cpp
--- a/kcmkwin/kwindecoration/declarative-plugin/previewitem.cpp
+++ b/kcmkwin/kwindecoration/declarative-plugin/previewitem.cpp
@@ -25,6 +25,7 @@
 #include <KDecoration2/DecorationSettings>
 #include <KDecoration2/DecorationShadow>
 #include <KDecoration2/DecoratedClient>
+#include <QCoreApplication>
 #include <QCursor>
 #include <QPainter>
 #include <QQmlContext>