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
@@ -13,7 +13,7 @@
  *
  * @MigrateSource(
  *   id = "d6_language_content_menu_settings",
- *   source_module = "i18n_memu"
+ *   source_module = "i18nmenu"
  * )
  */
 class LanguageContentMenuSettings extends DrupalSqlBase {
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_module = "i18n_strings"
+ *   source_module = "i18nstrings"
  * )
  */
 class MenuLinkTranslation extends DrupalSqlBase {