diff --git a/dev-lua/lua-resty-string/lua-resty-string-0.16.ebuild b/dev-lua/lua-resty-string/lua-resty-string-0.16.ebuild
index 70b48a247f517..32d7f567beb05 100644
--- a/dev-lua/lua-resty-string/lua-resty-string-0.16.ebuild
+++ b/dev-lua/lua-resty-string/lua-resty-string-0.16.ebuild
@@ -15,7 +15,7 @@ SRC_URI="
 
 LICENSE="BSD-2"
 SLOT="0"
-KEYWORDS=""
+KEYWORDS="~arm64"
 # Tests require replicating much of nginx-module_src_test() in each
 # dev-lua/lua-resty-* ebuild.
 RESTRICT="test"