diff --git a/config/robots.txt b/config/robots.txt
index f594075..71a3797 100644
--- a/config/robots.txt
+++ b/config/robots.txt
@@ -1,3 +1,3 @@
 User-agent: *
 Disallow: /haddock/
-Sitemap: /sitemap.xml
+Sitemap: https://www.stackage.org/sitemap.xml