diff --git a/dev-ruby/stringio/stringio-3.1.5.ebuild b/dev-ruby/stringio/stringio-3.1.5.ebuild
index 2d12d8628bd60..d5a4349f91359 100644
--- a/dev-ruby/stringio/stringio-3.1.5.ebuild
+++ b/dev-ruby/stringio/stringio-3.1.5.ebuild
@@ -16,7 +16,7 @@ SRC_URI="https://github.com/ruby/stringio/archive/v${PV}.tar.gz -> ${P}.tar.gz"
 
 LICENSE="BSD-2"
 SLOT="0"
-KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~loong ~mips ~ppc ppc64 ~riscv ~s390 sparc x86 ~amd64-linux ~x86-linux ~arm64-macos ~ppc-macos ~x64-macos ~x64-solaris"
+KEYWORDS="~alpha ~amd64 arm ~arm64 ~hppa ~loong ~mips ~ppc ppc64 ~riscv ~s390 sparc x86 ~amd64-linux ~x86-linux ~arm64-macos ~ppc-macos ~x64-macos ~x64-solaris"
 IUSE="test"
 
 ruby_add_bdepend "test? ( dev-ruby/test-unit dev-ruby/test-unit-ruby-core )"