diff --git a/dev-python/pluggy/pluggy-0.13.1.ebuild b/dev-python/pluggy/pluggy-0.13.1.ebuild
index f0141a9595e65..4efc417a5ce34 100644
--- a/dev-python/pluggy/pluggy-0.13.1.ebuild
+++ b/dev-python/pluggy/pluggy-0.13.1.ebuild
@@ -13,7 +13,7 @@ SRC_URI="mirror://pypi/${P:0:1}/${PN}/${P}.tar.gz"
 
 LICENSE="MIT"
 SLOT="0"
-KEYWORDS="~alpha amd64 arm arm64 hppa ~ia64 ppc ppc64 sparc x86"
+KEYWORDS="~alpha amd64 arm arm64 hppa ~ia64 ppc ppc64 ~s390 sparc x86"
 
 RDEPEND="$(python_gen_cond_dep \
 	'dev-python/importlib_metadata[${PYTHON_USEDEP}]' -2 python3_{5,6,7} pypy3)"