diff --git a/recipes/mainichi_en.recipe b/recipes/mainichi_en.recipe
index c73fd4a164..4f3af7ed7a 100644
--- a/recipes/mainichi_en.recipe
+++ b/recipes/mainichi_en.recipe
@@ -15,7 +15,7 @@ class MainichiEnglishNews(BasicNewsRecipe):
     description    = 'Japanese traditional newspaper Mainichi news in English'
     publisher      = 'Mainichi News'
     category       = 'news, japan'
-    language       = 'en_JA'
+    language       = 'en_JP'
     index          = 'http://mainichi.jp/english/english/index.html'
     remove_javascript = True
     masthead_url = 'http://mainichi.jp/english/images/themainichi.png'
diff --git a/src/calibre/utils/localization.py b/src/calibre/utils/localization.py
index 9384047d2c..b63552f098 100644
--- a/src/calibre/utils/localization.py
+++ b/src/calibre/utils/localization.py
@@ -118,6 +118,7 @@ _extra_lang_codes = {
         'zh_HK' : _('Chinese (HK)'),
         'zh_TW' : _('Traditional Chinese'),
         'en'    : _('English'),
+        'en_AR' : _('English (Argentina)'),
         'en_AU' : _('English (Australia)'),
         'en_JP' : _('English (Japan)'),
         'en_DE' : _('English (Germany)'),