diff --git a/rcpch_nhs_organisations/settings.py b/rcpch_nhs_organisations/settings.py
index 43ccae0..ffd90d0 100644
--- a/rcpch_nhs_organisations/settings.py
+++ b/rcpch_nhs_organisations/settings.py
@@ -41,6 +41,15 @@
     "0.0.0.0",
 ]
 
+if os.getenv("WEBSITE_SITE_NAME"):
+    ALLOWED_HOSTS = ["*"]
+else:
+    ALLOWED_HOSTS = [
+        "127.0.0.1",
+        "localhost",
+        "0.0.0.0",
+    ]
+
 # Application definition
 
 INSTALLED_APPS = [