diff --git a/tailbone/views/products.py b/tailbone/views/products.py
index 1eb2eb75..0af8b09a 100644
--- a/tailbone/views/products.py
+++ b/tailbone/views/products.py
@@ -516,7 +516,7 @@ class ProductsView(MasterView):
             pform = params_forms.get(batch_key)
             if pform:
                 pdata = pform.validate(controls)
-                for field in pform:
+                for field in pform.schema:
                     param_name = pform.schema[field.name].param_name
                     params[param_name] = pdata[field.name]