diff --git a/test/phpunit/FunctionsTest.php b/test/phpunit/FunctionsTest.php
index 1c6f23193d9..2a81b2e6d4e 100755
--- a/test/phpunit/FunctionsTest.php
+++ b/test/phpunit/FunctionsTest.php
@@ -28,6 +28,7 @@ global $conf,$user,$langs,$db;
 require_once 'PHPUnit/Autoload.php';
 require_once dirname(__FILE__).'/../../htdocs/master.inc.php';
 require_once dirname(__FILE__).'/../../htdocs/core/lib/date.lib.php';
+require_once dirname(__FILE__).'/../../htdocs/core/lib/json.lib.php';
 
 if (! defined('NOREQUIREUSER'))  define('NOREQUIREUSER','1');
 if (! defined('NOREQUIREDB'))    define('NOREQUIREDB','1');