diff --git a/maas/client/viscera/interfaces.py b/maas/client/viscera/interfaces.py
index c9d2a22..f726239 100644
--- a/maas/client/viscera/interfaces.py
+++ b/maas/client/viscera/interfaces.py
@@ -94,6 +94,7 @@ class Interface(Object, metaclass=InterfaceTypeMeta):
     parents = ObjectFieldRelatedSet(
         "parents", "Interfaces", reverse=None, map_func=map_nic_name_to_dict
     )
+    product = ObjectField.Checked("product", check(str), readonly=True)
     children = ObjectFieldRelatedSet(
         "children", "Interfaces", reverse=None, map_func=map_nic_name_to_dict
     )