diff --git a/library/Unl/Cas.php b/library/Unl/Cas.php
index 7a0ba8cf06c8cb755938567675dc1f9ad51994a8..f2d26578f40153f729198928ca2d59bb287b1bdb 100644
--- a/library/Unl/Cas.php
+++ b/library/Unl/Cas.php
@@ -323,7 +323,8 @@ class Unl_Cas
                 'automatic_serialization' => TRUE
             );
             $backendOptions = array(
-                'cache_dir' => $cache_dir
+                'cache_dir' => $cache_dir,
+                'file_locking' => FALSE
             );
             $this->_ticketCache = Zend_Cache::factory('Core', 'File', $frontendOptions, $backendOptions);
         }