--- /dev/null
+<?php
+
+namespace Drupal\block_content\Plugin\migrate\source\d6;
+
+use Drupal\block_content\Plugin\migrate\source\d7\BlockCustomTranslation as D7BlockCustomTranslation;
+
+/**
+ * Gets Drupal 6 i18n custom block translations from database.
+ *
+ * @MigrateSource(
+ * id = "d6_box_translation",
+ * source_module = "i18nblocks"
+ * )
+ */
+class BoxTranslation extends D7BlockCustomTranslation {
+
+ /**
+ * Drupal 6 table names.
+ */
+ const CUSTOM_BLOCK_TABLE = 'boxes';
+ const I18N_STRING_TABLE = 'i18n_strings';
+
+}