diff --git a/chrome/locale/en-US/zotero/zotero.dtd b/chrome/locale/en-US/zotero/zotero.dtd
index acadc09f57..a30f57dbfe 100644
--- a/chrome/locale/en-US/zotero/zotero.dtd
+++ b/chrome/locale/en-US/zotero/zotero.dtd
@@ -41,6 +41,7 @@
 <!ENTITY zotero.toolbar.export.label					"Export Library...">
 <!ENTITY zotero.toolbar.preferences.label				"Preferences...">
 <!ENTITY zotero.toolbar.about.label					"About Zotero...">
+<!ENTITY zotero.toolbar.advancedSearch				"Advanced Search">
 <!ENTITY zotero.toolbar.search.label					"Search:">
 <!ENTITY zotero.toolbar.fullscreen.tooltip				"Toggle Fullscreen Mode">
 <!ENTITY zotero.toolbar.goToURL.label					"View">