diff --git a/app/helpers/languages_helper.rb b/app/helpers/languages_helper.rb
index 798f027167..5fc2d96d74 100644
--- a/app/helpers/languages_helper.rb
+++ b/app/helpers/languages_helper.rb
@@ -196,6 +196,7 @@ module LanguagesHelper
     kab: ['Kabyle', 'Taqbaylit'].freeze,
     ldn: ['Láadan', 'Láadan'].freeze,
     lfn: ['Lingua Franca Nova', 'lingua franca nova'].freeze,
+    pdc: ['Pennsylvania Dutch', 'Pennsilfaani-Deitsch'].freeze,
     sco: ['Scots', 'Scots'].freeze,
     sma: ['Southern Sami', 'Åarjelsaemien Gïele'].freeze,
     smj: ['Lule Sami', 'Julevsámegiella'].freeze,