diff --git a/code-server.subdomain.conf.sample b/code-server.subdomain.conf.sample
index e45708b..412df4c 100644
--- a/code-server.subdomain.conf.sample
+++ b/code-server.subdomain.conf.sample
@@ -4,7 +4,7 @@ server {
     listen 443 ssl;
     listen [::]:443 ssl;
 
-    server_name code-server.*;
+    server_name code-server.* "~^[0-9]{1,10}\.code-server\..*$";
 
     include /config/nginx/ssl.conf;