diff --git a/dev-ruby/childlabor/childlabor-0.0.3-r2.ebuild b/dev-ruby/childlabor/childlabor-0.0.3-r2.ebuild
index 7b1cd5ca95570..f91d72b822aaf 100644
--- a/dev-ruby/childlabor/childlabor-0.0.3-r2.ebuild
+++ b/dev-ruby/childlabor/childlabor-0.0.3-r2.ebuild
@@ -19,7 +19,7 @@ SRC_URI="https://github.com/carllerche/childlabor/archive/${COMMIT_ID}.tar.gz ->
 
 LICENSE="MIT"
 SLOT="0"
-KEYWORDS="amd64 ~arm ~arm64 ~hppa ~ppc ppc64 ~riscv ~sparc x86"
+KEYWORDS="amd64 ~arm ~arm64 ~hppa ~ppc ppc64 ~riscv ~s390 ~sparc x86"
 IUSE="test"
 
 RUBY_S="${PN}-${COMMIT_ID}"