diff --git a/src/Symfony/Component/Form/FileField.php b/src/Symfony/Component/Form/FileField.php
index 1323fc8a72..3b4b440c6a 100644
--- a/src/Symfony/Component/Form/FileField.php
+++ b/src/Symfony/Component/Form/FileField.php
@@ -24,4 +24,12 @@ class FileField extends InputField
             'type' => 'file',
         ), $attributes));
     }
-}
\ No newline at end of file
+
+    /**
+     * {@inheritDoc}
+     */
+    public function isMultipart()
+    {
+        return true;
+    }
+}