diff --git a/modules/default/calendar/calendarfetcher.js b/modules/default/calendar/calendarfetcher.js
index 5b6c79bc..faa9714a 100644
--- a/modules/default/calendar/calendarfetcher.js
+++ b/modules/default/calendar/calendarfetcher.js
@@ -55,7 +55,7 @@ const CalendarFetcher = function (url, reloadInterval, excludedEvents, maximumEn
 			} else if (auth.method === "digest") {
 				fetcher = new digest(auth.user, auth.pass).fetch(url, { headers: headers, httpsAgent: httpsAgent });
 			} else {
-				headers.Authorization = "Basic " + base64.encode(auth.user + ":" + auth.pass);
+				headers.Authorization = "Basic " + Buffer.from(auth.user + ":" + auth.pass).toString("base64");
 			}
 		}
 		if (fetcher === null) {