diff --git a/installer/installer.kmdr b/installer/installer.kmdr
index c1509b0..52cb6ba 100755
--- a/installer/installer.kmdr
+++ b/installer/installer.kmdr
@@ -1516,7 +1516,8 @@ elif [ "$DESKTOP_SESSION" == "lxde" -o "$DESKTOP_SESSION" == "LXDE" ]; then
       /org/freedesktop/ConsoleKit/Manager org.freedesktop.ConsoleKit.Manager.Restart
 else
 # assume KDE4 as default (or use KDE_FULL_SESSION == true)
-   /usr/bin/qdbus org.kde.ksmserver /KSMServer logout 0 1 2
+   dbus-send --session --print-reply --dest=org.kde.ksmserver /KSMServer \
+      org.kde.KSMServerInterface.logout int32:0 int32:1 int32:2
 fi
 @endif
 </string>