diff --git a/route.php b/route.php
index b03fd9d..d64ae38 100644
--- a/route.php
+++ b/route.php
@@ -404,7 +404,7 @@ class route
       {
         $this->error ($e);
       }
-      require ("domframework/renderer.php");
+      require_once ("domframework/renderer.php");
       $renderer = new renderer ();
       $renderer->result = $data;
       $renderer->output = $this->output;
@@ -458,7 +458,7 @@ class route
       {
         $this->error ($e);
       }
-      require ("domframework/renderer.php");
+      require_once ("domframework/renderer.php");
       $renderer = new renderer ();
       $renderer->result = $data;
       $renderer->output = $this->output;
@@ -528,7 +528,7 @@ class route
     }
     // TODO : If the output is HTML, add the header line :
     // echo "    <meta name='ROBOTS' content='NOINDEX, NOFOLLOW'>\n";
-    require ("domframework/renderer.php");
+    require_once ("domframework/renderer.php");
     $renderer = new renderer ();
     $renderer->result = $message;
     $renderer->output = $this->output;