diff --git a/dev-libs/gumbo/gumbo-0.10.1.ebuild b/dev-libs/gumbo/gumbo-0.10.1.ebuild
index 74a04e0bd9813..9111f7d2f3da6 100644
--- a/dev-libs/gumbo/gumbo-0.10.1.ebuild
+++ b/dev-libs/gumbo/gumbo-0.10.1.ebuild
@@ -11,7 +11,7 @@ SRC_URI="https://github.com/google/gumbo-parser/archive/v${PV}.tar.gz -> ${P}.ta
 
 LICENSE="Apache-2.0"
 SLOT="0"
-KEYWORDS="~alpha amd64 arm arm64 ~hppa ~ia64 ppc ppc64 x86 ~ppc-macos ~x64-macos ~x86-macos ~sparc-solaris ~sparc64-solaris ~x64-solaris ~x86-solaris"
+KEYWORDS="~alpha amd64 arm arm64 ~hppa ~ia64 ppc ppc64 ~s390 x86 ~ppc-macos ~x64-macos ~x86-macos ~sparc-solaris ~sparc64-solaris ~x64-solaris ~x86-solaris"
 IUSE="doc test"
 RESTRICT="!test? ( test )"