diff --git a/management/univention-management-console-frontend/univention-management-console-web-server b/management/univention-management-console-frontend/univention-management-console-web-server
index 5897064..f1e659a 100755
--- a/management/univention-management-console-frontend/univention-management-console-web-server
+++ b/management/univention-management-console-frontend/univention-management-console-web-server
@@ -672,10 +672,7 @@ class Ressource(object):
 		# set the cookie once during successful authentication
 		# force expiration of cookie in 5 years from now on...
 		# IE does not support max-age
-		expires = kwargs.get('expires')
-		if expires is None:
-			expires = datetime.datetime.now()
-			expires = expires.replace(year=expires.year + 4)
+		expires = kwargs.get('expires') or (datetime.datetime.now() + datetime.timedelta(days=5*365))
 		cookie = cherrypy.response.cookie
 		for name, value in cookies:
 			name = self.suffixed_cookie_name(name)