diff --git a/app/controllers/checkout_controller.rb b/app/controllers/checkout_controller.rb
index 31c5f89bbb..edb92f8b8d 100644
--- a/app/controllers/checkout_controller.rb
+++ b/app/controllers/checkout_controller.rb
@@ -98,12 +98,6 @@ class CheckoutController < ::BaseController
     !@order || @order.completed? || !@order.checkout_allowed?
   end
 
-  def valid_order_line_items?
-    @order.insufficient_stock_lines.empty? &&
-      OrderCycleDistributedVariants.new(@order.order_cycle, @order.distributor).
-        distributes_order_variants?(@order)
-  end
-
   def handle_invalid_stock
     cancel_incomplete_payments if valid_payment_intent_provided?
     reset_order_to_cart
diff --git a/app/controllers/concerns/order_stock_check.rb b/app/controllers/concerns/order_stock_check.rb
index 2adfaf67be..98cea69387 100644
--- a/app/controllers/concerns/order_stock_check.rb
+++ b/app/controllers/concerns/order_stock_check.rb
@@ -3,6 +3,12 @@
 module OrderStockCheck
   extend ActiveSupport::Concern
 
+  def valid_order_line_items?
+    @order.insufficient_stock_lines.empty? &&
+      OrderCycleDistributedVariants.new(@order.order_cycle, @order.distributor).
+        distributes_order_variants?(@order)
+  end
+
   def handle_insufficient_stock
     return if sufficient_stock?