diff --git a/dev-python/xlwt/xlwt-1.3.0-r1.ebuild b/dev-python/xlwt/xlwt-1.3.0-r1.ebuild
index 26c718356ab98..3d02836bae3e0 100644
--- a/dev-python/xlwt/xlwt-1.3.0-r1.ebuild
+++ b/dev-python/xlwt/xlwt-1.3.0-r1.ebuild
@@ -12,7 +12,7 @@ SRC_URI="mirror://pypi/${PN:0:1}/${PN}/${P}.tar.gz"
 
 LICENSE="BSD"
 SLOT="0"
-KEYWORDS="amd64 arm arm64 ~hppa ppc ppc64 ~riscv sparc x86 ~amd64-linux ~x86-linux"
+KEYWORDS="amd64 arm arm64 ~hppa ppc ppc64 ~riscv ~s390 sparc x86 ~amd64-linux ~x86-linux"
 IUSE="examples"
 
 distutils_enable_sphinx docs \