diff --git a/shell/main.cpp b/shell/main.cpp
index 3ba3ad4be..b60406ac6 100644
--- a/shell/main.cpp
+++ b/shell/main.cpp
@@ -27,6 +27,7 @@
 
 #include <KAboutData>
 #include <KQuickAddons/QtQuickSettings>
+#include <KWindowSystem>
 
 #include <kdbusservice.h>
 #include <klocalizedstring.h>