diff --git a/src/calibre/gui2/actions/polish.py b/src/calibre/gui2/actions/polish.py
index 10d2830a18..773adb9820 100644
--- a/src/calibre/gui2/actions/polish.py
+++ b/src/calibre/gui2/actions/polish.py
@@ -336,7 +336,7 @@ class Report(QDialog):  # {{{
         bb.rejected.connect(self.reject)
         b = self.log_button = bb.addButton(_('View full &log'), QDialogButtonBox.ButtonRole.ActionRole)
         b.clicked.connect(self.view_log)
-        bb.button(bb.Close).setDefault(True)
+        bb.button(QDialogButtonBox.StandardButton.Close).setDefault(True)
         l.addWidget(bb, 2, 1)
 
         self.finished.connect(self.show_next, type=Qt.ConnectionType.QueuedConnection)
diff --git a/src/calibre/gui2/dialogs/custom_recipes.py b/src/calibre/gui2/dialogs/custom_recipes.py
index 2d057fd20f..79ca6e493c 100644
--- a/src/calibre/gui2/dialogs/custom_recipes.py
+++ b/src/calibre/gui2/dialogs/custom_recipes.py
@@ -583,7 +583,7 @@ class CustomRecipes(Dialog):
         bb = self.bb
         bb.clear()
         if index == 0:
-            bb.setStandardButtons(bb.Close)
+            bb.setStandardButtons(QDialogButtonBox.StandardButton.Close)
             for icon, text, tooltip, receiver in self.list_actions:
                 b = bb.addButton(text, QDialogButtonBox.ButtonRole.ActionRole)
                 b.setIcon(QIcon(I(icon))), b.setToolTip(tooltip)
diff --git a/src/calibre/gui2/preferences/__init__.py b/src/calibre/gui2/preferences/__init__.py
index 8367262266..76291e6568 100644
--- a/src/calibre/gui2/preferences/__init__.py
+++ b/src/calibre/gui2/preferences/__init__.py
@@ -368,7 +368,7 @@ def show_config_widget(category, name, gui=None, show_restart_msg=False,
     bb.button(QDialogButtonBox.StandardButton.Apply).clicked.connect(d.accept)
 
     def onchange():
-        b = bb.button(bb.Apply)
+        b = bb.button(QDialogButtonBox.StandardButton.Apply)
         b.setEnabled(True)
         b.setDefault(True)
         b.setAutoDefault(True)