diff --git a/chrome/content/zotero/xpcom/attachments.js b/chrome/content/zotero/xpcom/attachments.js
index 407cfb8d8b..3461524839 100644
--- a/chrome/content/zotero/xpcom/attachments.js
+++ b/chrome/content/zotero/xpcom/attachments.js
@@ -606,9 +606,10 @@ Zotero.Attachments = new function(){
 		 Kindle (kindle://) 
 		 Logos (logosres:) 
 		 Bear (bear://)
+		 MarginNote (marginnoteapp://)
 		 Zotero (zotero://) */
 
-		var urlRe = /^((https?|zotero|evernote|onenote|brain|nv|mlo|kindle|x-devonthink-item|bear|ftp):\/\/|logosres:)[^\s]*$/;
+		var urlRe = /^((https?|zotero|evernote|onenote|brain|nv|mlo|kindle|x-devonthink-item|bear|marginnoteapp|ftp):\/\/|logosres:)[^\s]*$/;
 		var matches = urlRe.exec(url);
 		if (!matches) {
 			throw ("Invalid URL '" + url + "' in Zotero.Attachments.linkFromURL()");