diff --git a/rrdtool.spec b/rrdtool.spec
index bc19b8f..9373030 100644
--- a/rrdtool.spec
+++ b/rrdtool.spec
@@ -26,8 +26,8 @@ Name: rrdtool
 Version: 1.7.1
 Release: 1%{?dist}
 License: GPLv2+ with exceptions
-URL: http://oss.oetiker.ch/rrdtool/
-Source0: http://oss.oetiker.ch/%{name}/pub/%{name}-%{version}.tar.gz
+URL: https://oss.oetiker.ch/rrdtool/
+Source0: https://oss.oetiker.ch/%{name}/pub/%{name}-%{version}.tar.gz
 Source1: php4-%{svnrev}.tar.gz
 Patch1: rrdtool-1.4.4-php54.patch
 # disable logo for php 5.5.