diff --git a/dev-ruby/thor/thor-0.19.4.ebuild b/dev-ruby/thor/thor-0.19.4.ebuild
index 3a8b6aaf3850b..21005803cb065 100644
--- a/dev-ruby/thor/thor-0.19.4.ebuild
+++ b/dev-ruby/thor/thor-0.19.4.ebuild
@@ -19,7 +19,7 @@ SRC_URI="https://github.com/erikhuda/${PN}/archive/v${PV}.tar.gz -> ${PN}-git-${
 
 LICENSE="MIT"
 SLOT="0"
-KEYWORDS="~amd64 ~arm ~ppc64 ~amd64-linux"
+KEYWORDS="~amd64 ~arm ~arm64 ~ppc64 ~amd64-linux"
 IUSE="doc"
 
 USE_RUBY="ruby21 ruby22 ruby23" ruby_add_bdepend "