diff --git a/modules/stock_shipment_measurements/stock.py b/modules/stock_shipment_measurements/stock.py
index 9e0a6a2c33..007bec65c5 100644
--- a/modules/stock_shipment_measurements/stock.py
+++ b/modules/stock_shipment_measurements/stock.py
@@ -178,7 +178,7 @@ class Move(metaclass=PoolMeta):
         super().cancel(moves)
         shipments = defaultdict(set)
         for move in moves:
-            if issubclass(move.shipment, MeasurementsMixin):
+            if isinstance(move.shipment, MeasurementsMixin):
                 shipments[move.shipment.__class__].add(move.shipment)
         for Shipment, shipments in shipments.items():
             Shipment.set_measurements(shipments)