diff --git a/dev-python/commentjson/commentjson-0.9.0-r2.ebuild b/dev-python/commentjson/commentjson-0.9.0-r2.ebuild
index ea280db94caea..73ae219c23511 100644
--- a/dev-python/commentjson/commentjson-0.9.0-r2.ebuild
+++ b/dev-python/commentjson/commentjson-0.9.0-r2.ebuild
@@ -20,7 +20,7 @@ SRC_URI="
 
 LICENSE="MIT"
 SLOT="0"
-KEYWORDS="~alpha amd64 arm arm64 ~hppa ~m68k ppc ppc64 ~riscv ~sparc x86"
+KEYWORDS="~alpha amd64 arm arm64 ~hppa ~m68k ppc ppc64 ~riscv ~s390 ~sparc x86"
 
 RDEPEND="
 	dev-python/lark[${PYTHON_USEDEP}]