diff --git a/docker/nginx/conf.d/client.conf b/docker/nginx/conf.d/client.conf
index a5db3ca6..c1a78ee8 100644
--- a/docker/nginx/conf.d/client.conf
+++ b/docker/nginx/conf.d/client.conf
@@ -22,7 +22,7 @@ server {
 	listen [::]:80 default_server;
 
 	# parse subdomain (a base32 encoded Skylink) into custom variable
-	server_name ~^([a-z0-9]{55}).*?;
+	server_name "~^([a-z0-9]{55})\..*$";
 	set $subdomain $1;
 
 	# ddos protection: closing slow connections