diff --git a/system/helpers/form_helper.php b/system/helpers/form_helper.php
index 47f93e7..d9305c0 100644
--- a/system/helpers/form_helper.php
+++ b/system/helpers/form_helper.php
@@ -94,7 +94,7 @@
  */
 if ( ! function_exists('form_open_multipart'))
 {
-	function form_open_multipart($action, $attributes = array(), $hidden = array())
+	function form_open_multipart($action = '', $attributes = array(), $hidden = array())
 	{
 		if (is_string($attributes))
 		{