diff -u b/core/modules/migrate_drupal/src/Plugin/migrate/builder/d6/TermNode.php b/core/modules/migrate_drupal/src/Plugin/migrate/builder/d6/TermNode.php
--- b/core/modules/migrate_drupal/src/Plugin/migrate/builder/d6/TermNode.php
+++ b/core/modules/migrate_drupal/src/Plugin/migrate/builder/d6/TermNode.php
@@ -80,7 +80,7 @@
   public function buildMigrations(array $template) {
     $migrations = [];
 
-    foreach ($this->getVocabularyIdMap() as $source_vid => $destination_vid) {
+    foreach ($this->getVocabularyIdMap($template['source']) as $source_vid => $destination_vid) {
       $values = $template;
       $values['id'] .= '__' . $source_vid;
       $values['source']['vid'] = $source_vid;