diff --git a/whois.spec b/whois.spec
index 9e86474..475412e 100644
--- a/whois.spec
+++ b/whois.spec
@@ -5,7 +5,7 @@ Release: 1
 License: GPL
 Vendor: Marco d'Itri <md@linux.it>
 Group: Applications/Internet
-Source: http://ftp.debian.org/debian/pool/main/w/whois/whois_%{version}.tar.gz
+Source: http://ftp.debian.org/debian/pool/main/w/whois/whois_%{version}.tar.xz
 BuildRoot: /var/tmp/%{name}-root
 Prefix: /usr