diff --git a/ubiquity/frontend/kde_ui.py b/ubiquity/frontend/kde_ui.py
index 5d5f84b72..515e379b9 100755
--- a/ubiquity/frontend/kde_ui.py
+++ b/ubiquity/frontend/kde_ui.py
@@ -335,9 +335,10 @@ class Wizard(BaseFrontend):
         elif self.oem_user_config:
             self.ui.setWindowTitle(self.get_string('oem_user_config_title'))
             self.ui.setWindowIcon(QtGui.QIcon.fromTheme("preferences-system"))
-            flags = self.ui.windowFlags() ^ QtCore.Qt.WindowMinMaxButtonsHint
+            flags = self.ui.windowFlags() | QtCore.Qt.CustomizeWindowHint
+            flags &= ~QtCore.Qt.WindowMinMaxButtonsHint
             if hasattr(QtCore.Qt, 'WindowCloseButtonHint'):
-                flags = flags ^ QtCore.Qt.WindowCloseButtonHint
+                flags &= ~QtCore.Qt.WindowCloseButtonHint
             self.ui.setWindowFlags(flags)
             self.ui.quit.hide()
             # TODO cjwatson 2010-04-07: provide alternative strings instead