diff --git a/install.sh b/install.sh
index 0f75549..3d5adfc 100755
--- a/install.sh
+++ b/install.sh
@@ -228,7 +228,7 @@ server:
 
 # Shared registration secrets to allow registering new users from the management UI
 registration_secrets:
-    example.com:
+    $home_server:
         # Client-server API URL
         url: https://$home_server
         # registration_shared_secret from synapse config