--- /dev/null
+<?php
+
+namespace Drupal\path\Plugin\migrate\process\d6;
+
+use Drupal\migrate\MigrateExecutableInterface;
+use Drupal\migrate\ProcessPluginBase;
+use Drupal\migrate\Row;
+use Drupal\Core\Language\LanguageInterface;
+
+/**
+ * Url alias language code process.
+ *
+ * @MigrateProcessPlugin(
+ * id = "d6_url_alias_language"
+ * )
+ */
+class UrlAliasLanguage extends ProcessPluginBase {
+
+ /**
+ * {@inheritdoc}
+ */
+ public function transform($value, MigrateExecutableInterface $migrate_executable, Row $row, $destination_property) {
+ $langcode = ($value === '') ? LanguageInterface::LANGCODE_NOT_SPECIFIED : $value;
+ return $langcode;
+ }
+
+}