diff --git a/calendar/locales/en-US/chrome/calendar/calendar.dtd b/calendar/locales/en-US/chrome/calendar/calendar.dtd
index d83071997d4..a78120e34d5 100644
--- a/calendar/locales/en-US/chrome/calendar/calendar.dtd
+++ b/calendar/locales/en-US/chrome/calendar/calendar.dtd
@@ -372,6 +372,7 @@
 <!ENTITY calendar.wizard.publish.label             "Publish: Publish events to a remote machine (ie. on the Internet) for others to subscribe to.">
 
 <!-- Calendar Import Duplicates Dialog -->
+<!ENTITY calendar.importdupes.dialog.title "Duplicate Management" >
 <!ENTITY calendar.importdupes.caption.label "What to do with duplicates:">
 <!ENTITY calendar.importdupes.autodiscard.label "Automatically discard duplicates">
 <!ENTITY calendar.importdupes.adddupes.label "Add duplicates">