Index: wp-includes/query.php
===================================================================
--- wp-includes/query.php	(revision 17521)
+++ wp-includes/query.php	(working copy)
@@ -3254,7 +3254,7 @@
 	 *
 	 * @since 3.1.0
 	 *
-	 * @param mixed $page Page ID, title, slug, or array of such.
+	 * @param mixed $page Page ID, title, slug, path, or array of such.
 	 * @return bool
 	 */
 	function is_page( $page = '' ) {
@@ -3274,6 +3274,8 @@
 			return true;
 		else if ( in_array( $page_obj->post_name, $page ) )
 			return true;
+		else if ( in_array( get_page_uri( $page_obj ), $page ) )
+			return true;
 
 		return false;
 	}