diff --git a/src/plugins/windowsystem/windowsystem.cpp b/src/plugins/windowsystem/windowsystem.cpp
index 7c1da6b5b6..6368114f82 100644
--- a/src/plugins/windowsystem/windowsystem.cpp
+++ b/src/plugins/windowsystem/windowsystem.cpp
@@ -74,10 +74,6 @@ QPixmap WindowSystem::icon(WId win, int width, int height, bool scale, int flags
     return QPixmap();
 }
 
-void WindowSystem::lowerWindow(WId win)
-{
-}
-
 bool WindowSystem::mapViewport()
 {
     return false;
diff --git a/src/plugins/windowsystem/windowsystem.h b/src/plugins/windowsystem/windowsystem.h
index 0a4bbbf656..ac2ddeafb8 100644
--- a/src/plugins/windowsystem/windowsystem.h
+++ b/src/plugins/windowsystem/windowsystem.h
@@ -36,7 +36,6 @@ public:
     void minimizeWindow(WId win) override;
     void unminimizeWindow(WId win) override;
     void raiseWindow(WId win) override;
-    void lowerWindow(WId win) override;
     QRect workArea(int desktop) override;
     QRect workArea(const QList<WId> &excludes, int desktop) override;
     QString desktopName(int desktop) override;