diff --git a/core/modules/migrate/src/Plugin/migrate/process/Migration.php b/core/modules/migrate/src/Plugin/migrate/process/Migration.php
index 45fdd5c..32df37b 100644
--- a/core/modules/migrate/src/Plugin/migrate/process/Migration.php
+++ b/core/modules/migrate/src/Plugin/migrate/process/Migration.php
@@ -122,6 +122,8 @@ public function transform($value, MigrateExecutable $migrate_executable, Row $ro
       foreach (array_keys($source_ids) as $index => $source_id) {
         $values[$source_id] = $source_id_values[$migration->id()][$index];
       }
+
+      $values['plugin'] = $migration->getSourcePlugin()->getPluginId();
       $stub_row = new Row($values, $source_ids + $migration->get('source'));
       $stub_row->stub(TRUE);
       // Do a normal migration with the stub row.