diff --git a/app-text/xhtml1/xhtml1-20020801-r6.ebuild b/app-text/xhtml1/xhtml1-20020801-r6.ebuild
index 7ae0fb63abac8..82f096bdede5c 100644
--- a/app-text/xhtml1/xhtml1-20020801-r6.ebuild
+++ b/app-text/xhtml1/xhtml1-20020801-r6.ebuild
@@ -10,7 +10,7 @@ SRC_URI="mirror://gentoo/${P}.tgz"
 
 LICENSE="W3C"
 SLOT="0"
-KEYWORDS="amd64 ~arm arm64 ~hppa ~ia64 ppc ~ppc64 ~riscv ~sparc x86 ~amd64-linux ~x86-linux ~ppc-macos"
+KEYWORDS="amd64 ~arm arm64 ~hppa ~ia64 ppc ~ppc64 ~riscv ~s390 ~sparc x86 ~amd64-linux ~x86-linux ~ppc-macos"
 IUSE=""
 
 DEPEND="app-text/sgml-common