diff --git a/chrome/content/zotero/xpcom/attachments.js b/chrome/content/zotero/xpcom/attachments.js
index 9889b72a00..e79fc79688 100644
--- a/chrome/content/zotero/xpcom/attachments.js
+++ b/chrome/content/zotero/xpcom/attachments.js
@@ -95,6 +95,8 @@ Zotero.Attachments = new function(){
 				// Copy file to unique filename, which automatically shortens long filenames
 				newFile = Zotero.File.copyToUnique(file, newFile);
 				
+				yield Zotero.File.setNormalFilePermissions(newFile.path);
+				
 				if (!contentType) {
 					contentType = yield Zotero.MIME.getMIMETypeFromFile(newFile);
 				}