diff --git a/modules/whois/__init__.py b/modules/whois/__init__.py
index 4b967f7c..b3c08770 100644
--- a/modules/whois/__init__.py
+++ b/modules/whois/__init__.py
@@ -57,6 +57,9 @@ async def get_whois(msg, domain):
     if not domain_name:
         await msg.finish(msg.locale.t("whois.message.get_failed"))
 
+    if whois_server:
+        whois_server = whois_server.lower()
+        
     if name_servers:
         name_servers_list = list(set([i.lower() for i in name_servers]))
     else: