diff --git a/dev-python/pytest-check/pytest-check-1.0.4.ebuild b/dev-python/pytest-check/pytest-check-1.0.4.ebuild
index 5fa4d693a6396..5ce07f29614d4 100644
--- a/dev-python/pytest-check/pytest-check-1.0.4.ebuild
+++ b/dev-python/pytest-check/pytest-check-1.0.4.ebuild
@@ -16,7 +16,7 @@ SRC_URI="
 
 LICENSE="MIT"
 SLOT="0"
-KEYWORDS="amd64 arm arm64 ~hppa ~ia64 ppc ppc64 ~riscv sparc x86"
+KEYWORDS="amd64 arm arm64 ~hppa ~ia64 ppc ppc64 ~riscv ~s390 sparc x86"
 
 RDEPEND=">=dev-python/pytest-6[${PYTHON_USEDEP}]"
 BDEPEND="dev-python/flit_core[${PYTHON_USEDEP}]"