diff --git a/dev-ml/mccs/mccs-1.1.13.ebuild b/dev-ml/mccs/mccs-1.1.13.ebuild
index 9c0417e9c5bc4..13b947434b03d 100644
--- a/dev-ml/mccs/mccs-1.1.13.ebuild
+++ b/dev-ml/mccs/mccs-1.1.13.ebuild
@@ -14,7 +14,7 @@ S="${WORKDIR}"/ocaml-${PN}-$(ver_rs 2 '-')
 
 LICENSE="BSD"
 SLOT="0/${PV}"
-KEYWORDS="amd64 arm arm64 ppc ppc64 x86"
+KEYWORDS="~amd64 ~arm ~arm64 ~ppc ~ppc64 ~x86"
 IUSE="+ocamlopt test"
 RESTRICT="!test? ( test )"