--- a/eric6/Plugins/VcsPlugins/vcsMercurial/ShelveExtension/HgShelvesSelectionDialog.py	Mon Mar 01 17:48:43 2021 +0100
+++ b/eric6/Plugins/VcsPlugins/vcsMercurial/ShelveExtension/HgShelvesSelectionDialog.py	Tue Mar 02 17:17:09 2021 +0100
@@ -31,14 +31,15 @@
         self.message.setText(message)
         self.shelvesList.addItems(shelveNames)
         
-        self.buttonBox.button(QDialogButtonBox.Ok).setEnabled(False)
+        self.buttonBox.button(
+            QDialogButtonBox.StandardButton.Ok).setEnabled(False)
     
     @pyqtSlot()
     def on_shelvesList_itemSelectionChanged(self):
         """
         Private slot to enabled the OK button if items have been selected.
         """
-        self.buttonBox.button(QDialogButtonBox.Ok).setEnabled(
+        self.buttonBox.button(QDialogButtonBox.StandardButton.Ok).setEnabled(
             len(self.shelvesList.selectedItems()) > 0)
     
     def getSelectedShelves(self):