diff --git a/chrome/content/zotero/xpcom/storage/webdav.js b/chrome/content/zotero/xpcom/storage/webdav.js
index ed56f1cc09..d9329997b4 100644
--- a/chrome/content/zotero/xpcom/storage/webdav.js
+++ b/chrome/content/zotero/xpcom/storage/webdav.js
@@ -221,6 +221,7 @@ Zotero.Sync.Storage.Mode.WebDAV.prototype = {
 				"OPTIONS",
 				this.rootURI,
 				{
+					successCodes: [200, 204, 404],
 					errorDelayIntervals: this.ERROR_DELAY_INTERVALS,
 					errorDelayMax: this.ERROR_DELAY_MAX,
 				}
@@ -622,7 +623,7 @@ Zotero.Sync.Storage.Mode.WebDAV.prototype = {
 			"OPTIONS",
 			uri,
 			{
-				successCodes: [200, 404],
+				successCodes: [200, 204, 404],
 				requestObserver: function (req) {
 					if (req.channel) {
 						channel = req.channel;