diff --git a/core/lib/Drupal/Core/Field/Plugin/migrate/cckfield/NodeReference.php b/core/lib/Drupal/Core/Field/Plugin/migrate/cckfield/NodeReference.php
index 8cb6198..bc24849 100644
--- a/core/lib/Drupal/Core/Field/Plugin/migrate/cckfield/NodeReference.php
+++ b/core/lib/Drupal/Core/Field/Plugin/migrate/cckfield/NodeReference.php
@@ -81,17 +81,17 @@ public function transformFieldInstanceSettings(Row $row) {
   }
 
   /**
-   * Look up migrated role IDs from the d6_node_type migration.
+   * Look up migrated node types from the d6_node_type migration.
    *
    * @param $source_node_types
-   *   The source role IDs.
+   *   The source node types.
    *
    * @return array
-   *   The migrated role IDs.
+   *   The migrated node types.
    */
   protected function migrateNodeTypes($source_node_types) {
     // Configure the migration process plugin to look up migrated IDs from
-    // the d6_user_role migration.
+    // the d6_node_type migration.
     $migration_plugin_configuration = [
       'migration' => $this->nodeTypeMigration,
     ];
@@ -102,11 +102,11 @@ protected function migrateNodeTypes($source_node_types) {
     $migrationPlugin = $this->migratePluginManager
       ->createInstance('migration', $migration_plugin_configuration, $migration);
 
-    $roles = [];
+    $node_types = [];
     foreach ($source_node_types as $role) {
-      $roles[] = $migrationPlugin->transform($role, $executable, $row, NULL);
+      $node_types[] = $migrationPlugin->transform($role, $executable, $row, NULL);
     }
-    return array_combine($roles, $roles);
+    return array_combine($node_types, $node_types);
   }
 
 }