diff -u b/core/modules/migrate_drupal_ui/src/Batch/MigrateUpgradeImportBatch.php b/core/modules/migrate_drupal_ui/src/Batch/MigrateUpgradeImportBatch.php
--- b/core/modules/migrate_drupal_ui/src/Batch/MigrateUpgradeImportBatch.php
+++ b/core/modules/migrate_drupal_ui/src/Batch/MigrateUpgradeImportBatch.php
@@ -18,7 +18,7 @@
 /**
  * Runs a single migration batch.
  */
-class MigrateUpgradeImportBatch extends MigrateUpgradeBatchBase {
+class MigrateUpgradeImportBatch {
 
   /**
    * Maximum number of previous messages to display.
diff -u b/core/modules/migrate_drupal_ui/src/Form/MigrateUpgradeForm.php b/core/modules/migrate_drupal_ui/src/Form/MigrateUpgradeForm.php
--- b/core/modules/migrate_drupal_ui/src/Form/MigrateUpgradeForm.php
+++ b/core/modules/migrate_drupal_ui/src/Form/MigrateUpgradeForm.php
@@ -10,7 +10,6 @@
 use Drupal\Core\Url;
 use Drupal\migrate\Plugin\MigrationPluginManagerInterface;
 use Drupal\migrate_drupal_ui\Batch\MigrateUpgradeImportBatch;
-use Drupal\migrate_drupal_ui\Batch\MigrateUpgradeImportFinish;
 use Drupal\migrate_drupal\MigrationConfigurationTrait;
 use Symfony\Component\DependencyInjection\ContainerInterface;