Index: wp-content/themes/twentyeleven/style.css
===================================================================
--- wp-content/themes/twentyeleven/style.css	(revision 18756)
+++ wp-content/themes/twentyeleven/style.css	(working copy)
@@ -615,7 +615,8 @@
 	display: block;
 }
 #access .current_page_item > a,
-#access .current_page_ancestor > a {
+#access .current_page_ancestor > a,
+#access .current-page-ancestor > a {
 	font-weight: bold;
 }