diff --git a/stock.py b/stock.py
index 41b02cf183..c71c7242bf 100644
--- a/stock.py
+++ b/stock.py
@@ -551,11 +551,11 @@ class ShipmentDrop(Workflow, ModelSQL, ModelView):
                 if qty:
                     product_cost[product] = round_price(cost / qty)
 
-            for c_move in shipment.customer_moves:
-                cost_price = product_cost[c_move.product]
-                if cost_price != c_move.cost_price:
-                    c_move.cost_price = cost_price
-                    to_save.append(c_move)
+            for move in shipment.moves:
+                cost_price = product_cost[move.product]
+                if cost_price != move.cost_price:
+                    move.cost_price = cost_price
+                    to_save.append(move)
         if to_save:
             Move.save(to_save)
 
diff --git a/tests/scenario_sale_supply_drop_shipment.rst b/tests/scenario_sale_supply_drop_shipment.rst
index c7035e8a54..369544bdca 100644
--- a/tests/scenario_sale_supply_drop_shipment.rst
+++ b/tests/scenario_sale_supply_drop_shipment.rst
@@ -282,6 +282,9 @@ Receive purchase invoice at different price::
 
     >>> shipment, = [s for s in purchase.drop_shipments
     ...     if s.state == 'done']
+    >>> move, = shipment.supplier_moves
+    >>> move.cost_price
+    Decimal('4.0000')
     >>> move, = shipment.customer_moves
     >>> move.cost_price
     Decimal('4.0000')