diff --git a/addons/purchase_stock/models/purchase.py b/addons/purchase_stock/models/purchase.py
index b14a2d8073c..b1f861c041c 100644
--- a/addons/purchase_stock/models/purchase.py
+++ b/addons/purchase_stock/models/purchase.py
@@ -361,6 +361,12 @@ class PurchaseOrderLine(models.Model):
                     if move.location_dest_id.usage == "supplier":
                         if move.to_refund:
                             total -= move.product_uom._compute_quantity(move.product_uom_qty, line.product_uom)
+                    elif move.origin_returned_move_id._is_dropshipped() and not move._is_dropshipped_returned():
+                        # Edge case: the dropship is returned to the stock, no to the supplier.
+                        # In this case, the received quantity on the PO is set although we didn't
+                        # receive the product physically in our stock. To avoid counting the
+                        # quantity twice, we do nothing.
+                        pass
                     else:
                         total += move.product_uom._compute_quantity(move.product_uom_qty, line.product_uom)
             line.qty_received = total