diff --git a/dev-python/toml/toml-0.10.0-r1.ebuild b/dev-python/toml/toml-0.10.0-r1.ebuild
index 336d4031a2e16..957fda0cb85fd 100644
--- a/dev-python/toml/toml-0.10.0-r1.ebuild
+++ b/dev-python/toml/toml-0.10.0-r1.ebuild
@@ -17,7 +17,7 @@ IUSE="test"
 
 LICENSE="BSD"
 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"
 
 # peculiar testing depending on https://github.com/BurntSushi/toml-test. Not
 # particularly worth the trouble.