diff --git a/chrome/content/zotero/xpcom/data/item.js b/chrome/content/zotero/xpcom/data/item.js
index 1cafbf096a..208fc55d0b 100644
--- a/chrome/content/zotero/xpcom/data/item.js
+++ b/chrome/content/zotero/xpcom/data/item.js
@@ -1546,7 +1546,7 @@ Zotero.Item.prototype.save = function() {
 							let attachmentFile = Components.classes["@mozilla.org/file/local;1"]
 								.createInstance(Components.interfaces.nsILocalFile);
 							try {
-								attachmentFile.initWithPath(path);
+								attachmentFile.persistentDescriptor = path;
 							}
 							catch (e) {
 								Zotero.debug(e, 1);
@@ -1981,7 +1981,7 @@ Zotero.Item.prototype.save = function() {
 							let attachmentFile = Components.classes["@mozilla.org/file/local;1"]
 								.createInstance(Components.interfaces.nsILocalFile);
 							try {
-								attachmentFile.initWithPath(path);
+								attachmentFile.persistentDescriptor = path;
 							}
 							catch (e) {
 								Zotero.debug(e, 1);