diff --git a/lib/tasks/migrate/20241216215050_set_language_for_explainers.rake b/lib/tasks/migrate/20241216215050_set_language_for_explainers.rake
index 3084967c2..f137113c1 100644
--- a/lib/tasks/migrate/20241216215050_set_language_for_explainers.rake
+++ b/lib/tasks/migrate/20241216215050_set_language_for_explainers.rake
@@ -7,7 +7,7 @@ namespace :check do
       i = 0
       query.find_each do |explainer|
         i += 1
-        language = explainer.team&.get_language || 'unk' 
+        language = explainer.team&.get_language || 'und'
         explainer.update_column(:language, language)
         puts "[#{Time.now}] [#{i}/#{n}] Setting language for explainer ##{explainer.id} as #{language}"
       end