diff --git a/source/sources/ics_feed.ts b/source/sources/ics_feed.ts
index 420c2de..160e10b 100644
--- a/source/sources/ics_feed.ts
+++ b/source/sources/ics_feed.ts
@@ -48,7 +48,19 @@ namespace _munin.sources.ics_feed
 			"version": "HTTP/2",
 			"method": lib_plankton.http.enum_method.get,
 			"query": ("?" + url.query),
-			"headers": {},
+			"headers": (
+				((url.username !== null) && (url.password !== null))
+				?
+				{
+					/**
+					 * @todo use lib_plankton.base64
+					 */
+					"Authorization": ("Basic " + Buffer.from(url.username + ":" + url.password).toString("base64")),
+				}
+				:
+				{
+				}
+			),
 			"body": null,
 		};
 		const http_response : lib_plankton.http.type_response = await lib_plankton.http.call(http_request);