diff --git a/browser/themes/shared/sidebar.css b/browser/themes/shared/sidebar.css
index a9b3886e1ff4a36c5bd161985719f66a41d95458..242b3ad30785bed1937d9bf99e8abc7427111541 100644
--- a/browser/themes/shared/sidebar.css
+++ b/browser/themes/shared/sidebar.css
@@ -2,6 +2,8 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
+@import url("chrome://browser/skin/zen-sidebar.css");
+
 @namespace html url("http://www.w3.org/1999/xhtml");
 
 :root {