diff --git a/app/api.php b/app/api.php
index 8771cff..efb6955 100644
--- a/app/api.php
+++ b/app/api.php
@@ -1,10 +1,6 @@
 <?php
 
-class Api {
-	
-	function __construct (&$app) {
-		$this->app =& $app;
-	}
+class Api extends RackMiddleware {
 	
 	function call (&$env) {
 		if ( preg_match("/^\/api\/([a-z]{1}[a-z0-9]*)/i", $env["PATH_INFO"], $match) ) {
diff --git a/app/format.php b/app/format.php
index e6c9906..04aa8d0 100644
--- a/app/format.php
+++ b/app/format.php
@@ -1,10 +1,6 @@
 <?php
 
-class Format {
-	
-	function __construct (&$app) {
-		$this->app =& $app;
-	}
+class Format extends RackMiddleware {
 	
 	function call (&$env) {