diff --git a/src/Symfony/Component/HttpFoundation/FileBag.php b/src/Symfony/Component/HttpFoundation/FileBag.php
index 4baebc8823..118f8fb7d6 100644
--- a/src/Symfony/Component/HttpFoundation/FileBag.php
+++ b/src/Symfony/Component/HttpFoundation/FileBag.php
@@ -23,6 +23,20 @@ class FileBag extends ParameterBag
 {
     private $fileKeys = array('error', 'name', 'size', 'tmp_name', 'type');
 
+    /**
+     * Constructor.
+     *
+     * @param array $headers An array of HTTP files
+     */
+    public function __construct(array $parameters = array())
+    {
+        // this line is not necessary, but including it avoids any stupid
+        // errors if we add code to the parent's constructor
+        parent::__construct();
+
+        $this->replace($parameters);
+    }
+
     /**
      * (non-PHPdoc)
      * @see Symfony\Component\HttpFoundation\ParameterBag::replace()
diff --git a/src/Symfony/Component/HttpFoundation/ResponseHeaderBag.php b/src/Symfony/Component/HttpFoundation/ResponseHeaderBag.php
index 0d0ff011dc..120a8fc290 100644
--- a/src/Symfony/Component/HttpFoundation/ResponseHeaderBag.php
+++ b/src/Symfony/Component/HttpFoundation/ResponseHeaderBag.php
@@ -20,6 +20,20 @@ class ResponseHeaderBag extends HeaderBag
 {
     protected $computedCacheControl = array();
 
+    /**
+     * Constructor.
+     *
+     * @param array $headers An array of HTTP headers
+     */
+    public function __construct(array $parameters = array())
+    {
+        // this line is not necessary, but including it avoids any stupid
+        // errors if we add code to the parent's constructor
+        parent::__construct();
+
+        $this->replace($parameters);
+    }
+
     /**
      * {@inheritdoc}
      */