diff --git a/library/includes/functions_validate.php b/library/includes/functions_validate.php
index 0dd490bd..84386276 100644
--- a/library/includes/functions_validate.php
+++ b/library/includes/functions_validate.php
@@ -45,7 +45,7 @@ function validate_username ($username, $check_ban_and_taken = true)
 
 		if ($row = DB()->fetch_row("SELECT username FROM ". BB_USERS ." WHERE username = '$username_sql' LIMIT 1"))
 		{
-			if ((!IS_GUEST && $row['username'] != $user->name) || IS_GUEST || (request_var('admin', '') && IS_ADMIN))
+			if ((!IS_GUEST && $row['username'] != $user->name) || IS_GUEST)
 			{
 				return $lang['USERNAME_TAKEN'];
 			}
@@ -111,4 +111,4 @@ function validate_email ($email, $check_ban_and_taken = true)
 	}
 
 	return false;
-}
+}
\ No newline at end of file