diff --git a/code/ddns-lambda.py b/code/ddns-lambda.py
index bd823c5..52991eb 100755
--- a/code/ddns-lambda.py
+++ b/code/ddns-lambda.py
@@ -1044,7 +1044,7 @@ def lambda_handler(
 
 
 def put_instance_dns_data_item(dynamodb_client, DDBNAME, instance_id, dns):
-    dns_list = [dict(d._asdict) for d in dns]
+    dns_list = [dict(d._asdict()) for d in dns]
     dns_info = json.dumps(dns_list, default=json_serial)
 
     LOGGER.debug(f"put dns data into {instance_id}/dns: {str(dns_info)}: {lineno()}")