diff --git a/core/modules/file/src/Plugin/migrate/process/d6/CckFile.php b/core/modules/file/src/Plugin/migrate/process/d6/CckFile.php
index fd2f42c..2b91989 100644
--- a/core/modules/file/src/Plugin/migrate/process/d6/CckFile.php
+++ b/core/modules/file/src/Plugin/migrate/process/d6/CckFile.php
@@ -50,11 +50,9 @@ public function __construct(array $configuration, $plugin_id, $plugin_definition
    */
   public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition, MigrationInterface $migration = NULL) {
     // Configure the migration process plugin to look up migrated IDs from
-    // the d6_file migration.
-    $migration_plugin_configuration = [
-      'source' => ['fid'],
-      'migration' => 'd6_file',
-    ];
+    // a d6 file migration.
+    $migration_plugin_configuration = ['source' => ['fid']] + $configuration;
+    $migration_plugin_configuration += ['migration' => 'd6_file'];
 
     return new static(
       $configuration,