diff --git a/lib/irc.js b/lib/irc.js
index 104964e9..9bc96d3e 100644
--- a/lib/irc.js
+++ b/lib/irc.js
@@ -977,7 +977,7 @@ Client.prototype._speak = function(kind, target, text) {
 Client.prototype.whois = function(nick, callback) {
     if (typeof callback === 'function') {
         var callbackWrapper = function(info) {
-            if (info.nick == nick) {
+            if (info.nick.toLowerCase() == nick.toLowerCase()) {
                 this.removeListener('whois', callbackWrapper);
                 return callback.apply(this, arguments);
             }