diff --git a/chrome/content/zotero/zoteroPane.js b/chrome/content/zotero/zoteroPane.js
index 7eba87be24..e954fd923d 100644
--- a/chrome/content/zotero/zoteroPane.js
+++ b/chrome/content/zotero/zoteroPane.js
@@ -4329,7 +4329,8 @@ var ZoteroPane = new function()
 						extraData && extraData.location,
 						{
 							openInWindow: (event && event.shiftKey)
-								|| (extraData && extraData.forceOpenPDFInWindow)
+								|| (extraData && extraData.forceOpenPDFInWindow),
+							allowDuplicate: event && event.shiftKey
 						}
 					);
 					return;