diff --git a/wp-admin/includes/media.php b/wp-admin/includes/media.php
index 4054d28f6b..d9d6538e92 100644
--- a/wp-admin/includes/media.php
+++ b/wp-admin/includes/media.php
@@ -1532,7 +1532,7 @@ SWFUpload.onload = function() {
 function media_upload_type_form($type = 'file', $errors = null, $id = null) {
 	media_upload_header();
 
-	$post_id = intval($_REQUEST['post_id']);
+	$post_id = isset( $_REQUEST['post_id'] )? intval( $_REQUEST['post_id'] ) : 0;
 
 	$form_action_url = admin_url("media-upload.php?type=$type&tab=type&post_id=$post_id");
 	$form_action_url = apply_filters('media_upload_form_url', $form_action_url, $type);