diff --git a/wp-admin/update-core.php b/wp-admin/update-core.php
index c388f43616..ff327006e6 100644
--- a/wp-admin/update-core.php
+++ b/wp-admin/update-core.php
@@ -19,6 +19,7 @@ function list_core_update( $update ) {
 	if ( !isset($update->response) || 'latest' == $update->response )
 		$current = true;
 	$submit = __('Upgrade Automatically');
+	$form_action = 'update-core.php?action=do-core-upgrade';
 	if ( 'development' == $update->response ) {
 		$message = __('You are using a development version of WordPress.  You can upgrade to the latest nightly build automatically or download the nightly build and install it manually:');
 		$download = __('Download nightly build');
@@ -26,6 +27,7 @@ function list_core_update( $update ) {
 		if ( $current ) {
 			$message = sprintf(__('You have the latest version of WordPress. You do not need to upgrade. However, if you want to re-install version %s, you can do so automatically or download the package and re-install manually:'), $version_string);
 			$submit = __('Re-install Automatically');
+			$form_action = 'update-core.php?action=do-core-reinstall';
 		} else {
 			$message = 	sprintf(__('You can upgrade to version %s automatically or download the package and install it manually:'), $version_string);
 		}
@@ -35,7 +37,7 @@ function list_core_update( $update ) {
 	echo '<p>';
 	echo $message;
 	echo '</p>';
-	echo '<form method="post" action="update-core.php?action=do-core-upgrade" name="upgrade" class="upgrade">';
+	echo '<form method="post" action="' . $form_action . '" name="upgrade" class="upgrade">';
 	wp_nonce_field('upgrade-core');
 	echo '<p>';
 	echo '<input id="upgrade" class="button" type="submit" value="' . $submit . '" name="upgrade" />&nbsp;';
@@ -129,7 +131,7 @@ function core_upgrade_preamble() {
  *
  * @return null
  */
-function do_core_upgrade() {
+function do_core_upgrade( $reinstall = false ) {
 	global $wp_filesystem;
 
 	$url = wp_nonce_url('update-core.php?action=do-core-upgrade', 'upgrade-core');
@@ -159,6 +161,9 @@ function do_core_upgrade() {
 		return;
 	}
 
+	if ( $reinstall )
+		$update->response = 'reinstall';
+
 	$result = wp_update_core($update, 'show_message');
 
 	if ( is_wp_error($result) ) {
@@ -199,7 +204,7 @@ if ( 'upgrade-core' == $action ) {
 	require_once('admin-header.php');
 	core_upgrade_preamble();
 	include('admin-footer.php');
-} elseif ( 'do-core-upgrade' == $action ) {
+} elseif ( 'do-core-upgrade' == $action || 'do-core-reinstall' == $action ) {
 	check_admin_referer('upgrade-core');
 	$title = __('Upgrade WordPress');
 	$parent_file = 'tools.php';
@@ -210,7 +215,12 @@ if ( 'upgrade-core' == $action ) {
 	elseif ( isset( $_POST['undismiss'] ) )
 	do_undismiss_core_update();
 	require_once('admin-header.php');
+	if ( 'do-core-reinstall' == $action )
+		$reinstall = true;
+	else
+		$reinstall = false;
 	if ( isset( $_POST['upgrade'] ) )
-		do_core_upgrade();
+		do_core_upgrade($reinstall);
 	include('admin-footer.php');
+
 }?>