diff --git a/ksmserver/shutdowndlg.cpp b/ksmserver/shutdowndlg.cpp
--- a/ksmserver/shutdowndlg.cpp
+++ b/ksmserver/shutdowndlg.cpp
@@ -86,6 +86,7 @@
     // window stuff
     setClearBeforeRendering(true);
     setColor(QColor(Qt::transparent));
+    setFlag(Qt::FramelessWindowHint);
 
     setResizeMode(QQuickView::SizeRootObjectToView);
 
@@ -252,6 +253,7 @@
     // TODO: set a proper window type to indicate to KWin that this is the logout dialog
     // maybe we need a dedicated type for it?
     m_shellSurface->setPosition(geometry().topLeft());
+    m_shellSurface->setSkipTaskbar(true);
 }
 
 void KSMShutdownDlg::slotLogout()