Index: src/wp-admin/includes/widgets.php
===================================================================
--- src/wp-admin/includes/widgets.php	(revision 26594)
+++ src/wp-admin/includes/widgets.php	(working copy)
@@ -72,7 +72,7 @@
 
 	echo '<div id="' . esc_attr( $sidebar ) . '" class="widgets-sortables">';
 	if ( $sidebar_name ) {
-		if( 'Inactive Widgets' != $sidebar_name ) {
+		if( 'wp_inactive_widgets ' != $sidebar ) {
 		?>
 		<div class="sidebar-name">
 			<div class="sidebar-name-arrow"><br /></div>