diff --git a/dev-ruby/open4/open4-1.3.4.ebuild b/dev-ruby/open4/open4-1.3.4.ebuild
index 5ef01faa37d85..b6890ac0fe7a6 100644
--- a/dev-ruby/open4/open4-1.3.4.ebuild
+++ b/dev-ruby/open4/open4-1.3.4.ebuild
@@ -15,7 +15,7 @@ HOMEPAGE="https://github.com/ahoward/open4"
 
 LICENSE="MIT"
 SLOT="0"
-KEYWORDS="~amd64 ~ppc64 ~x86"
+KEYWORDS="~amd64 ~arm ~ppc64 ~x86"
 IUSE=""
 
 ruby_add_bdepend "test? ( dev-ruby/minitest )"