diff --git a/browser/themes/windows/browser.css b/browser/themes/windows/browser.css
index fe2eaa0ef90733894fc026e694beae4a079d78c4..f3be10989da624b9a8b50923cbb5e583d6006726 100644
--- a/browser/themes/windows/browser.css
+++ b/browser/themes/windows/browser.css
@@ -8,6 +8,8 @@
 
 @namespace html url("http://www.w3.org/1999/xhtml");
 
+%include ../custom/windows/windows.inc.css
+
 :root {
   --toolbar-non-lwt-bgcolor: -moz-dialog;
   --toolbar-non-lwt-textcolor: -moz-dialogtext;