diff --git a/modules/stock_package_shipping_ups/stock.py b/modules/stock_package_shipping_ups/stock.py
index 54077c5ff7..9ac87bab6b 100644
--- a/modules/stock_package_shipping_ups/stock.py
+++ b/modules/stock_package_shipping_ups/stock.py
@@ -213,8 +213,8 @@ class CreateShippingUPS(Wizard):
         shipment.shipping_reference = (
             shipment_results['ShipmentIdentificationNumber'])
         ups_packages = shipment_results['PackageResults']
-        if len(packages) == 1:
-            # In case only one package is requested UPS returns a dictionnary
+        if not isinstance(ups_packages, list):
+            # In case only one package is requested UPS may return a dictionary
             # instead of a list of one package
             ups_packages = [ups_packages]