diff --git a/apps/assets/serializers/asset/common.py b/apps/assets/serializers/asset/common.py
index 3ce150943..b61e2e286 100644
--- a/apps/assets/serializers/asset/common.py
+++ b/apps/assets/serializers/asset/common.py
@@ -174,7 +174,11 @@ class AssetSerializer(BulkOrgResourceModelSerializer, ResourceLabelsMixin, Writa
             'address': {'label': _('Address')},
             'nodes_display': {'label': _('Node path')},
             'nodes': {'allow_empty': True, 'label': _("Nodes")},
-            'directory_services': {'required': False, 'label': _("Directory service")},
+            'directory_services': {
+                'required': False,
+                'allow_empty': True,
+                'default': list, 'label': _("Directory service")
+            },
         }
 
     def __init__(self, *args, **kwargs):