Index: wp-content/themes/twentyeleven/style.css
===================================================================
--- wp-content/themes/twentyeleven/style.css	(revision 18968)
+++ wp-content/themes/twentyeleven/style.css	(working copy)
@@ -614,6 +614,8 @@
 #access ul li:hover > ul {
 	display: block;
 }
+#access .current-menu-item > a,
+#access .current-menu-ancestor > a,
 #access .current_page_item > a,
 #access .current_page_ancestor > a {
 	font-weight: bold;