diff --git a/nginxpwner.py b/nginxpwner.py
index ccc9261..5947865 100644
--- a/nginxpwner.py
+++ b/nginxpwner.py
@@ -37,7 +37,7 @@
 
 nginx_version = "https://github.com/nginx/nginx/tags"
 try:
-  target_nginx_version = basereq.headers["Server"].split("/")[1]
+  target_nginx_version = re.findall(r"\d+\.\d+\.\d+", basereq.headers["Server"])[0]
 except:
   print(f"{Fore.RED}No Server header found or invalid Server header. If you are sure that your target uses Nginx, it may happen either you are testing something built with NGINX or that a simple NGINX server has the server_tokens directive set to off. In any case, please use nginx-pwner-no-server-header.py")
   sys.exit()