diff --git a/chrome/content/zotero/xpcom/storage/zfs.js b/chrome/content/zotero/xpcom/storage/zfs.js
index d7e03efdff..bf46d22747 100644
--- a/chrome/content/zotero/xpcom/storage/zfs.js
+++ b/chrome/content/zotero/xpcom/storage/zfs.js
@@ -113,6 +113,7 @@ Zotero.Sync.Storage.Session.ZFS.prototype._getStorageFileInfo = function (item,
 			Zotero.debug(req.status);
 			Zotero.debug(item.key);
 			Zotero.debug(req.responseText);
+			Zotero.debug(req.getAllResponseHeaders());
 			//callback(item, false);
 			//return;
 		}