diff --git a/app/helpers/settings_helper.rb b/app/helpers/settings_helper.rb
index 74544bad98470d4397c8c883609a5d9de8a41331..87718dc0584363997f67f974d0815a4ab463a897 100644
--- a/app/helpers/settings_helper.rb
+++ b/app/helpers/settings_helper.rb
@@ -68,6 +68,7 @@ module SettingsHelper
     tr: 'Türkçe',
     uk: 'Українська',
     ur: 'اُردُو',
+    vi: 'Tiếng Việt',
     'zh-CN': '简体中文',
     'zh-HK': '繁體中文（香港）',
     'zh-TW': '繁體中文（臺灣）',
diff --git a/config/application.rb b/config/application.rb
index 4c34efa152c0d49652f70b3e03875fee7429bcf0..d1980cd68116ab0fa525a3bc108a43583542831d 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -106,6 +106,7 @@ module Mastodon
       :tr,
       :uk,
       :ur,
+      :vi,
       :'zh-CN',
       :'zh-HK',
       :'zh-TW',