diff --git a/electionleaflets/settings/base_lambda.py b/electionleaflets/settings/base_lambda.py
index 06686f14..129365ca 100644
--- a/electionleaflets/settings/base_lambda.py
+++ b/electionleaflets/settings/base_lambda.py
@@ -1,7 +1,7 @@
 import os
 from .base import *  # noqa: F401,F403
 
-ALLOWED_HOSTS = ["*"]
+ALLOWED_HOSTS = [os.environ.get('APP_DOMAIN')]
 
 DATABASES = {
     "default": {