diff --git a/app/models/spree/order.rb b/app/models/spree/order.rb
index 71d76036df..67018d85cf 100644
--- a/app/models/spree/order.rb
+++ b/app/models/spree/order.rb
@@ -47,6 +47,7 @@ module Spree
              dependent: :destroy
 
     has_many :line_item_adjustments, through: :line_items, source: :adjustments
+    has_many :shipment_adjustments, through: :shipments, source: :adjustments
     has_many :all_adjustments, class_name: 'Spree::Adjustment', dependent: :destroy
 
     has_many :shipments, dependent: :destroy do