diff --git a/chrome/content/zotero/preferences/preferences.xul b/chrome/content/zotero/preferences/preferences.xul
index d1c7b26109..06602aac58 100644
--- a/chrome/content/zotero/preferences/preferences.xul
+++ b/chrome/content/zotero/preferences/preferences.xul
@@ -58,6 +58,7 @@ To add a new preference:
 			<preference id="pref-automaticSnapshots" name="extensions.zotero.automaticSnapshots" type="bool"/>
 			<preference id="pref-downloadAssociatedFiles" name="extensions.zotero.downloadAssociatedFiles" type="bool"/>
 			<preference id="pref-automaticTags" name="extensions.zotero.automaticTags" type="bool"/>
+			<preference id="pref-trashAutoEmptyDays" name="extensions.zotero.trashAutoEmptyDays" type="int"/>
 			
 			<preference id="pref-groups-copyChildNotes" name="extensions.zotero.groups.copyChildNotes" type="bool"/>
 			<preference id="pref-groups-copyChildFileAttachments" name="extensions.zotero.groups.copyChildFileAttachments" type="bool"/>
@@ -140,6 +141,12 @@ To add a new preference:
 			<checkbox label="&zotero.preferences.automaticSnapshots;" preference="pref-automaticSnapshots"/>
 			<checkbox label="&zotero.preferences.downloadAssociatedFiles;" preference="pref-downloadAssociatedFiles"/>
 			<checkbox label="&zotero.preferences.automaticTags;" preference="pref-automaticTags"/>
+			
+			<hbox align="center">
+				<label value="&zotero.preferences.trashAutoEmptyDaysPre;"/>
+				<textbox size="2" preference="pref-trashAutoEmptyDays"/>
+				<label value="&zotero.preferences.trashAutoEmptyDaysPost;"/>
+			</hbox>
 		</groupbox>
 		
 		<groupbox>
diff --git a/chrome/locale/en-US/zotero/preferences.dtd b/chrome/locale/en-US/zotero/preferences.dtd
index e982721de7..bc511afa53 100644
--- a/chrome/locale/en-US/zotero/preferences.dtd
+++ b/chrome/locale/en-US/zotero/preferences.dtd
@@ -20,11 +20,13 @@
 <!ENTITY zotero.preferences.updateNow					"Update now">
 <!ENTITY zotero.preferences.reportTranslationFailure		"Report broken site translators">
 <!ENTITY zotero.preferences.zoteroDotOrgVersionHeader			"Allow zotero.org to customize content based on current Zotero version">
-<!ENTITY zotero.preferences.zoteroDotOrgVersionHeader.tooltip	"If enabled, the current Zotero version will be added to HTTP requests to zotero.org.">
+<!ENTITY zotero.preferences.zoteroDotOrgVersionHeader.tooltip	"If enabled, the current Zotero version will be included in HTTP requests to zotero.org.">
 <!ENTITY zotero.preferences.parseRISRefer				"Use Zotero for downloaded RIS/Refer files">
 <!ENTITY zotero.preferences.automaticSnapshots			"Automatically take snapshots when creating items from web pages">
 <!ENTITY zotero.preferences.downloadAssociatedFiles		"Automatically attach associated PDFs and other files when saving items">
 <!ENTITY zotero.preferences.automaticTags				"Automatically tag items with keywords and subject headings">
+<!ENTITY zotero.preferences.trashAutoEmptyDaysPre		"Automatically remove items in the trash deleted more than">
+<!ENTITY zotero.preferences.trashAutoEmptyDaysPost		"days ago">
 
 <!ENTITY zotero.preferences.groups						"Groups">
 <!ENTITY zotero.preferences.groups.whenCopyingInclude	"When copying items between libraries, include:">