diff --git a/brian_polling_manager/inventory.py b/brian_polling_manager/inventory.py
index 4b4594d22ce9556793c55a9b18be992c70b1495e..2ff111f436ec01a3afe966599f1a65906a6d4ffd 100644
--- a/brian_polling_manager/inventory.py
+++ b/brian_polling_manager/inventory.py
@@ -62,10 +62,7 @@ GWS_DIRECT_SCHEMA = {
             'type': 'object',
             'properties': {
                 'nren': {'type': 'string'},
-                'isp': {
-                    'type': 'string',
-                    'enum': ['Cogent', 'Telia', 'CenturyLink']
-                },
+                'isp': {'type': 'string'},
                 'hostname': {'type': 'string'},
                 'tag': {'type': 'string'},
             },