diff --git a/chrome/content/zotero/xpcom/storage.js b/chrome/content/zotero/xpcom/storage.js
index 0a615c4ac4..4cb96e050f 100644
--- a/chrome/content/zotero/xpcom/storage.js
+++ b/chrome/content/zotero/xpcom/storage.js
@@ -375,7 +375,8 @@ Zotero.Sync.Storage = new function () {
 		Zotero.Utilities.HTTP.doGet(uri, function (req) {
 			var funcName = "Zotero.Sync.Storage.getStorageModificationTime()";
 			
-			if (req.status == 404) {
+			// mod_speling can return 300s for 404s with base name matches
+			if (req.status == 404 || req.status == 300) {
 				callback(item, false);
 				return;
 			}