diff --git a/phpgwapi/inc/common_functions.inc.php b/phpgwapi/inc/common_functions.inc.php
index 09d8d30e5d..5177275fc7 100755
--- a/phpgwapi/inc/common_functions.inc.php
+++ b/phpgwapi/inc/common_functions.inc.php
@@ -1438,6 +1438,9 @@ function try_lang($key,$vars=null)
  */
 function __autoload($class)
 {
+	// fixing warnings generated by php 5.3.8 is_a($obj) trying to autoload huge strings
+	if (strlen($class) > 40) return;
+
 	$components = explode('_',$class);
 	$app = array_shift($components);
 	// classes using the new naming schema app_class_name, eg. admin_cmd