diff --git a/wp-admin/admin-db.php b/wp-admin/admin-db.php
index 41131a493..77e8db5e5 100644
--- a/wp-admin/admin-db.php
+++ b/wp-admin/admin-db.php
@@ -274,6 +274,13 @@ function wp_delete_user($id, $reassign = 'novalue') {
 	return true;
 }
 
+function wp_revoke_user($id) {
+	$id = (int) $id;
+	
+	$user = new WP_User($id);
+	$user->remove_all_caps();	
+}
+
 function get_link($link_id, $output = OBJECT) {
 	global $wpdb;
 
diff --git a/wp-includes/capabilities.php b/wp-includes/capabilities.php
index 22aed044c..ea571cbc4 100644
--- a/wp-includes/capabilities.php
+++ b/wp-includes/capabilities.php
@@ -232,6 +232,14 @@ class WP_User {
 		update_usermeta($this->id, $this->cap_key, $this->caps);
 	}
 
+	function remove_all_caps() {
+		global $wpdb;
+		$this->caps = array();
+		update_usermeta($this->id, $this->cap_key, '');
+		update_usermeta($this->id, $wpdb->prefix.'user_level', '');
+		$this->get_role_caps();
+	}
+
 	//has_cap(capability_or_role_name) or
 	//has_cap('edit_post', post_id)
 	function has_cap($cap) {