diff --git a/app/serializers/wizard_field_choice_serializer.rb b/app/serializers/wizard_field_choice_serializer.rb
index 38862540239..0a1fdf3e892 100644
--- a/app/serializers/wizard_field_choice_serializer.rb
+++ b/app/serializers/wizard_field_choice_serializer.rb
@@ -10,7 +10,7 @@ class WizardFieldChoiceSerializer < ApplicationSerializer
   def i18nkey
     field = object.field
     step = field.step
-    "wizard.step.#{step.id}.fields.#{field.id}.choices.#{id}"
+    "wizard.step.#{step.id}.fields.#{field.id}.choices.#{id}".underscore
   end
 
   def label