diff --git a/Slim/Http/Uri.php b/Slim/Http/Uri.php
index 630437b6e..4f586c2fa 100644
--- a/Slim/Http/Uri.php
+++ b/Slim/Http/Uri.php
@@ -150,7 +150,7 @@ public static function createFromEnvironment(Environment $env)
         $user = $env->get('PHP_AUTH_USER', '');
         $password = $env->get('PHP_AUTH_PW', '');
         $host = $env->get('HTTP_HOST', $env->get('SERVER_NAME'));
-        $port = $env->get('SERVER_PORT');
+        $port = $env->get('SERVER_PORT', 80);
 
         // Path
         $requestScriptName = parse_url($env->get('SCRIPT_NAME'), PHP_URL_PATH);