diff --git a/json.php b/json.php
index 3581ee2b85..02c6924f2d 100644
--- a/json.php
+++ b/json.php
@@ -18,7 +18,7 @@
  */
 function xajax_redirect(&$anon_account)
 {
-	$response = new egw_json_response();
+	$response = egw_json_response::get();
 	$response->redirect($GLOBALS['egw_info']['server']['webserver_url'].'/login.php?cd=10', true);
 	$response->printOutput();
 
@@ -39,7 +39,7 @@ function ajax_exception_handler(Exception $e)
 	{
 		_egw_log_exception($e,$message);
 	}
-	$response = new egw_json_response();
+	$response = egw_json_response::get();
 	$message .= ($message ? "\n\n" : '').$e->getMessage();
 
 	// only show trace (incl. function arguments) if explicitly enabled, eg. on a development system
diff --git a/phpgwapi/inc/class.egw_json.inc.php b/phpgwapi/inc/class.egw_json.inc.php
index 56ae6318a0..047b287eb7 100644
--- a/phpgwapi/inc/class.egw_json.inc.php
+++ b/phpgwapi/inc/class.egw_json.inc.php
@@ -183,6 +183,14 @@ class egw_json_response
 	 */
 	private static $response = null;
 
+	/**
+	 * Force use of singleton: $response = egw_json_response::get();
+	 */
+	private function __construct()
+	{
+
+	}
+
 	/**
 	 * Singelton for class
 	 *