diff --git a/binaryen.opam b/binaryen.opam
index 9c76e7ad..27d55e02 100644
--- a/binaryen.opam
+++ b/binaryen.opam
@@ -18,3 +18,4 @@ depends: [
   "js_of_ocaml-ppx" {>= "3.6.0"}
   "js_of_ocaml-compiler" {>= "3.6.0"}
 ]
+available: arch = "x86_64" & (os = "linux" | os = "macos" | os = "win32")