diff --git a/dev-libs/libbsd/libbsd-0.8.6.ebuild b/dev-libs/libbsd/libbsd-0.8.6.ebuild
index 081aa4cf82776..4e32f0a5ba99c 100644
--- a/dev-libs/libbsd/libbsd-0.8.6.ebuild
+++ b/dev-libs/libbsd/libbsd-0.8.6.ebuild
@@ -10,7 +10,7 @@ SRC_URI="https://${PN}.freedesktop.org/releases/${P}.tar.xz"
 
 LICENSE="BSD BSD-2 BSD-4 ISC"
 SLOT="0"
-KEYWORDS="alpha amd64 arm arm64 hppa ia64 ~mips ppc ppc64 sparc x86 ~amd64-linux ~x86-linux"
+KEYWORDS="alpha amd64 arm arm64 hppa ia64 ~mips ppc ppc64 s390 sparc x86 ~amd64-linux ~x86-linux"
 IUSE="static-libs"
 
 DEPEND=">=sys-kernel/linux-headers-3.17"
diff --git a/dev-libs/libbsd/libbsd-0.9.1.ebuild b/dev-libs/libbsd/libbsd-0.9.1.ebuild
index bde7f808bf8bf..80512aa7758cc 100644
--- a/dev-libs/libbsd/libbsd-0.9.1.ebuild
+++ b/dev-libs/libbsd/libbsd-0.9.1.ebuild
@@ -10,7 +10,7 @@ SRC_URI="https://${PN}.freedesktop.org/releases/${P}.tar.xz"
 
 LICENSE="BSD BSD-2 BSD-4 ISC"
 SLOT="0"
-KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~mips ~ppc ~ppc64 ~sparc ~x86 ~amd64-linux ~x86-linux"
+KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~mips ~ppc ~ppc64 ~s390 ~sparc ~x86 ~amd64-linux ~x86-linux"
 IUSE="static-libs"
 
 DEPEND=">=sys-kernel/linux-headers-3.17"