diff --git a/openlp/core/ui/printserviceform.py b/openlp/core/ui/printserviceform.py
index 37a170224..c285662bb 100644
--- a/openlp/core/ui/printserviceform.py
+++ b/openlp/core/ui/printserviceform.py
@@ -118,7 +118,7 @@ class PrintServiceForm(QtGui.QDialog, Ui_PrintServiceDialog):
         """
         Constructor
         """
-        QtGui.QDialog.__init__(self, self.main_window)
+        QtGui.QDialog.__init__(self, Registry().get('main_window'))
         self.printer = QtGui.QPrinter()
         self.print_dialog = QtGui.QPrintDialog(self.printer, self)
         self.document = QtGui.QTextDocument()