diff --git a/cockpit.spec b/cockpit.spec
index 96728ad..18496aa 100644
--- a/cockpit.spec
+++ b/cockpit.spec
@@ -79,7 +79,7 @@ URL:            https://cockpit-project.org/
 Version:        215
 %if %{defined wip}
 Release:        1.%{wip}%{?dist}
-Source0:        cockpit-%{version}.tar.gz
+Source0:        cockpit-%{version}.tar.xz
 %else
 Release:        0
 Source0:        https://github.com/cockpit-project/cockpit/releases/download/%{version}/cockpit-%{version}.tar.xz