diff --git a/sci-physics/fastjet-contrib/metadata.xml b/sci-physics/fastjet-contrib/metadata.xml
index 2ba65cdb8045e..1a470bb15f7bb 100644
--- a/sci-physics/fastjet-contrib/metadata.xml
+++ b/sci-physics/fastjet-contrib/metadata.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
+<!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
 <pkgmetadata>
 	<maintainer type="project">
 		<email>sci@gentoo.org</email>