diff --git a/src/IrcClient/IrcClient.cs b/src/IrcClient/IrcClient.cs
index 6fd60be..c71f4aa 100644
--- a/src/IrcClient/IrcClient.cs
+++ b/src/IrcClient/IrcClient.cs
@@ -534,7 +534,7 @@ public void Login(string[] nicklist, string realname, int usermode, string usern
             if (username != null && username.Length > 0) {
                 _Username = username.Replace(" ", "");
             } else {
-                _Username = Environment.UserName.Replace(" ", "");
+                _Username = Guid.NewGuid().ToString("n").Substring(0, 8);
             }
 
             if (password != null && password.Length > 0) {