diff --git a/dev-python/prompt_toolkit/prompt_toolkit-3.0.20.ebuild b/dev-python/prompt_toolkit/prompt_toolkit-3.0.20.ebuild
index 2311603cf192c..880a84917d1e3 100644
--- a/dev-python/prompt_toolkit/prompt_toolkit-3.0.20.ebuild
+++ b/dev-python/prompt_toolkit/prompt_toolkit-3.0.20.ebuild
@@ -13,7 +13,7 @@ SRC_URI="mirror://pypi/${PN:0:1}/${PN}/${P}.tar.gz"
 
 LICENSE="BSD"
 SLOT="0"
-KEYWORDS="~amd64 ~arm ~arm64 ~ppc ~ppc64 ~riscv ~sparc ~x86"
+KEYWORDS="~amd64 ~arm ~arm64 ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86"
 IUSE=""
 
 RDEPEND="