diff -u b/core/modules/language/src/Plugin/migrate/source/d6/LanguageContentMenuSettings.php b/core/modules/language/src/Plugin/migrate/source/d6/LanguageContentMenuSettings.php
--- b/core/modules/language/src/Plugin/migrate/source/d6/LanguageContentMenuSettings.php
+++ b/core/modules/language/src/Plugin/migrate/source/d6/LanguageContentMenuSettings.php
@@ -13,6 +13,7 @@
  *
  * @MigrateSource(
  *   id = "d6_language_content_menu_settings",
+ *   source_module = "i18n_memu"
  * )
  */
 class LanguageContentMenuSettings extends DrupalSqlBase {
diff -u b/core/modules/menu_link_content/migration_templates/d6_menu_links_translation.yml b/core/modules/menu_link_content/migration_templates/d6_menu_links_translation.yml
--- b/core/modules/menu_link_content/migration_templates/d6_menu_links_translation.yml
+++ b/core/modules/menu_link_content/migration_templates/d6_menu_links_translation.yml
@@ -33,9 +33,9 @@
       callable: current
   menu_name:
     -
-      plugin: migration
+      plugin: migration_lookup
       # The menu migration is in the system module.
-      migration: menu
+      migration: d6_menu
       source: menu_name
     -
       plugin: static_map
diff -u b/core/modules/menu_link_content/src/Plugin/migrate/source/d6/MenuLinkTranslation.php b/core/modules/menu_link_content/src/Plugin/migrate/source/d6/MenuLinkTranslation.php
--- b/core/modules/menu_link_content/src/Plugin/migrate/source/d6/MenuLinkTranslation.php
+++ b/core/modules/menu_link_content/src/Plugin/migrate/source/d6/MenuLinkTranslation.php
@@ -11,7 +11,7 @@
  *
  * @MigrateSource(
  *   id = "d6_menu_link_translation",
- *   source_provider = "i18n"
+ *   source_module = "i18n_strings"
  * )
  */
 class MenuLinkTranslation extends DrupalSqlBase {