diff --git a/dev-ruby/sys-uname/sys-uname-1.4.1.ebuild b/dev-ruby/sys-uname/sys-uname-1.4.1.ebuild
index 5fd3c1610b132..73cefffab55c0 100644
--- a/dev-ruby/sys-uname/sys-uname-1.4.1.ebuild
+++ b/dev-ruby/sys-uname/sys-uname-1.4.1.ebuild
@@ -17,7 +17,7 @@ HOMEPAGE="https://github.com/djberg96/sys-uname"
 
 LICENSE="Apache-2.0"
 SLOT="$(ver_cut 1)"
-KEYWORDS="~amd64 ~arm ~arm64 ~hppa ~loong ~ppc ~ppc64 ~riscv ~sparc ~x86"
+KEYWORDS="~amd64 ~arm ~arm64 ~hppa ~loong ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86"
 
 ruby_add_rdepend "
 	>=dev-ruby/ffi-1.1