diff --git a/trace-fuchsia.opam b/trace-fuchsia.opam
index 476cfba..09ddaa6 100644
--- a/trace-fuchsia.opam
+++ b/trace-fuchsia.opam
@@ -36,3 +36,4 @@ build: [
   ["dune" "install" "-p" name "--create-install-files" name]
 ]
 dev-repo: "git+https://github.com/c-cube/ocaml-trace.git"
+available: arch != "s390x"
diff --git a/trace-fuchsia.opam.template b/trace-fuchsia.opam.template
new file mode 100644
index 0000000..eaaf865
--- /dev/null
+++ b/trace-fuchsia.opam.template
@@ -0,0 +1 @@
+available: arch != "s390x"