diff --git a/app/controllers/letter/batches_controller.rb b/app/controllers/letter/batches_controller.rb
index 53b3bd2..45ae63a 100644
--- a/app/controllers/letter/batches_controller.rb
+++ b/app/controllers/letter/batches_controller.rb
@@ -242,11 +242,14 @@ class Letter::BatchesController < BaseBatchesController
   def validate_postage_types
     return unless @batch.letter_return_address&.us?
 
-    if @batch.us_postage_type.present? && !%w[stamps indicia].include?(@batch.us_postage_type)
+    us_postage_type = batch_params[:us_postage_type]
+    intl_postage_type = batch_params[:intl_postage_type]
+
+    if us_postage_type.present? && !%w[stamps indicia].include?(us_postage_type)
       @batch.errors.add(:us_postage_type, "must be either 'stamps' or 'indicia'")
     end
 
-    if @batch.intl_postage_type.present? && !%w[stamps indicia].include?(@batch.intl_postage_type)
+    if intl_postage_type.present? && !%w[stamps indicia].include?(intl_postage_type)
       @batch.errors.add(:intl_postage_type, "must be either 'stamps' or 'indicia'")
     end
   end