diff --git a/mozilla/xpfe/global/resources/content/hiddenWindow.xul b/mozilla/xpfe/global/resources/content/hiddenWindow.xul
index 89ccc028f03..3893e20bd47 100644
--- a/mozilla/xpfe/global/resources/content/hiddenWindow.xul
+++ b/mozilla/xpfe/global/resources/content/hiddenWindow.xul
@@ -42,6 +42,8 @@ Contributor(s): ______________________________________. -->
 %buildDTD;
 <!ENTITY % navigatorDTD SYSTEM "chrome://navigator/locale/navigator.dtd" >
 %navigatorDTD;
+<!ENTITY % navigatorTitleDTD SYSTEM "chrome://navigator/locale/navigator-title.dtd" >
+%navigatorTitleDTD;
 ]>
 
 <window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"