diff --git a/lib/common.lib.php b/lib/common.lib.php
index a0f4960f1..3e689d589 100644
--- a/lib/common.lib.php
+++ b/lib/common.lib.php
@@ -3804,7 +3804,7 @@ function check_vaild_callback($callback){
 class str_encrypt
 {
     var $salt;
-    var $lenght;
+    var $length;
 
     function __construct($salt='')
     {