diff --git a/account.py b/account.py
index b3b0d5dad5..ae6bc92e30 100644
--- a/account.py
+++ b/account.py
@@ -49,7 +49,7 @@ class InvoiceLine(metaclass=PoolMeta):
         Uom = pool.get('product.uom')
         quantity = 0
         for stock_move in self.stock_moves:
-            if stock_move.state != 'cancel':
+            if stock_move.state != 'cancelled':
                 quantity += Uom.compute_qty(
                     stock_move.uom, stock_move.quantity, self.unit)
         return quantity