diff --git a/change_log.txt b/change_log.txt
index c07a64e6..d4a2a90a 100644
--- a/change_log.txt
+++ b/change_log.txt
@@ -1,4 +1,9 @@
  ===== 3.1.22-dev ===== (xx.xx.2014)
+ 31.12.22014
+ - bugfix use function_exists('mb_get_info') for setting Smarty::$_MBSTRING. 
+   Function mb_split could be overloaded depending on php.ini mbstring.func_overload
+   
+   
  29.12.2014
  - new feature security can now limit the template nesting level by property $max_template_nesting
                 see also NEW_FEATURES.txt (forum 25370)
diff --git a/libs/Smarty.class.php b/libs/Smarty.class.php
index fa2ddffe..f9b7b328 100644
--- a/libs/Smarty.class.php
+++ b/libs/Smarty.class.php
@@ -53,7 +53,7 @@ if (!defined('SMARTY_PLUGINS_DIR')) {
     define('SMARTY_PLUGINS_DIR', SMARTY_DIR . 'plugins' . DS);
 }
 if (!defined('SMARTY_MBSTRING')) {
-    define('SMARTY_MBSTRING', function_exists('mb_split'));
+    define('SMARTY_MBSTRING', function_exists('mb_get_info'));
 }
 if (!defined('SMARTY_RESOURCE_CHAR_SET')) {
     // UTF-8 can only be done properly when mbstring is available!