diff --git a/stack_orchestrator/deploy/webapp/util.py b/stack_orchestrator/deploy/webapp/util.py
index 5949693e..d5098099 100644
--- a/stack_orchestrator/deploy/webapp/util.py
+++ b/stack_orchestrator/deploy/webapp/util.py
@@ -21,6 +21,7 @@ import random
 import subprocess
 import sys
 import tempfile
+from typing import List
 import uuid
 import yaml
 
@@ -687,7 +688,7 @@ def publish_deployment(
     deploy_record,
     deployment_lrns,
     existing_dns_records_by_lrns,
-    dns_lrns: list[str],
+    dns_lrns: List[str],
     dns_record_namespace,
     deployment_dir,
     dns_value=None,