diff --git a/app/helpers/languages_helper.rb b/app/helpers/languages_helper.rb
index 9e1c0a7db1d..fe2518ba62b 100644
--- a/app/helpers/languages_helper.rb
+++ b/app/helpers/languages_helper.rb
@@ -215,6 +215,7 @@ module LanguagesHelper
   # but a language family in spite of sharing the main locale code
   # We need to be able to filter these
   ISO_639_1_REGIONAL = {
+    'nan-TW': ['Taiwanese (Hokkien)', '臺語（Hô-ló話）'].freeze,
     'zh-CN': ['Chinese (China)', '简体中文'].freeze,
     'zh-HK': ['Chinese (Hong Kong)', '繁體中文（香港）'].freeze,
     'zh-TW': ['Chinese (Taiwan)', '繁體中文（臺灣）'].freeze,
diff --git a/config/initializers/i18n.rb b/config/initializers/i18n.rb
index 5e8d3a545e7..b8621f9aa39 100644
--- a/config/initializers/i18n.rb
+++ b/config/initializers/i18n.rb
@@ -64,6 +64,7 @@ Rails.application.configure do
     :mr,
     :ms,
     :my,
+    :'nan-TW',
     :nl,
     :nn,
     :no,