Index: trunk/wp-includes/widgets.php
===================================================================
--- trunk/wp-includes/widgets.php	(revision 38682)
+++ trunk/wp-includes/widgets.php	(working copy)
@@ -247,7 +247,7 @@
 		'class' => '',
 		'before_widget' => '<li id="%1$s" class="widget %2$s">',
 		'after_widget' => "</li>\n",
-		'before_title' => '<h2 class="widgettitle">',
+		'before_title' => '<h2 class="widget-title">',
 		'after_title' => "</h2>\n",
 	);