diff --git a/dev-ruby/rack-cache/rack-cache-1.5.1.ebuild b/dev-ruby/rack-cache/rack-cache-1.5.1.ebuild
index d270c03866630..f3077239c5907 100644
--- a/dev-ruby/rack-cache/rack-cache-1.5.1.ebuild
+++ b/dev-ruby/rack-cache/rack-cache-1.5.1.ebuild
@@ -20,7 +20,7 @@ SRC_URI="https://github.com/rtomayko/rack-cache/archive/v${PV}.tar.gz -> ${P}.ta
 
 LICENSE="MIT"
 SLOT="1.2"
-KEYWORDS="~amd64 ~arm ~ppc64"
+KEYWORDS="~amd64 ~arm ~ppc64 ~amd64-linux ~x86-linux ~ppc-macos ~x64-macos ~x86-macos ~sparc-solaris ~sparc64-solaris ~x64-solaris ~x86-solaris"
 IUSE=""
 
 ruby_add_rdepend "dev-ruby/rack:*"