--- a/eric6/Project/NewDialogClassDialog.py	Mon Mar 01 17:48:43 2021 +0100
+++ b/eric6/Project/NewDialogClassDialog.py	Tue Mar 02 17:17:09 2021 +0100
@@ -35,7 +35,8 @@
         
         self.pathnamePicker.setMode(E5PathPickerModes.DirectoryMode)
         
-        self.okButton = self.buttonBox.button(QDialogButtonBox.Ok)
+        self.okButton = self.buttonBox.button(
+            QDialogButtonBox.StandardButton.Ok)
         self.okButton.setEnabled(False)
         
         self.classnameEdit.setText(defaultClassName)