diff -u b/modules/toolbar/toolbar.module b/modules/toolbar/toolbar.module
--- b/modules/toolbar/toolbar.module
+++ b/modules/toolbar/toolbar.module
@@ -326,7 +326,7 @@
       $full_href = $item['link']['href'] . (isset($item['link']['options']['query']) ? '?' . $item['link']['options']['query'] : '');
       // Clean up the link destination to prepare a path based CSS class.
       $class = strtolower(preg_replace('/[^a-z0-9-_]+/i', '-', strtolower($full_href)));
-      $class = trim(preg_replace('/--+/', '-', $class, '-'), '-');
+      $class = trim(preg_replace('/--+/', '-', $class, '-'));
       // Prefix the path based CSS class.
       $class = 'path-' . $class;
       if (toolbar_in_active_trail($item['link']['href'])) {