diff --git a/qubesmanager/backup.py b/qubesmanager/backup.py
index 71e3eee2..7a1e9ce6 100644
--- a/qubesmanager/backup.py
+++ b/qubesmanager/backup.py
@@ -387,7 +387,7 @@ def reject(self):
                     'dom0', 'admin.backup.Cancel',
                     backup_utils.get_profile_name(True))
             except exc.QubesException as ex:
-                QtWidgets.QMessageBox.warning(
+                QtGui.QMessageBox.warning(
                     self, self.tr("Error cancelling backup!"),
                     self.tr("ERROR: {}").format(str(ex)))
 
diff --git a/qubesmanager/settings.py b/qubesmanager/settings.py
index 3618334e..6fe02c6b 100644
--- a/qubesmanager/settings.py
+++ b/qubesmanager/settings.py
@@ -658,7 +658,7 @@ def remove_vm(self):
             thread.finished.connect(self.clear_threads)
             self.threads_list.append(thread)
 
-            self.progress = QtWidgets.QProgressDialog(
+            self.progress = QtGui.QProgressDialog(
                 self.tr("Deleting Qube..."), "", 0, 0)
             self.progress.setCancelButton(None)
             self.progress.setModal(True)