diff --git a/packages/alsa/alsa.0.2.1/opam b/packages/alsa/alsa.0.2.1/opam
index 5dc3457f06d..c6c1f8a55fb 100644
--- a/packages/alsa/alsa.0.2.1/opam
+++ b/packages/alsa/alsa.0.2.1/opam
@@ -12,3 +12,4 @@ depexts: [
   [["ubuntu"] ["libasound2-dev"]]
 ]
 install: [make "install"]
+available: [ ocaml-version < "4.04.0" ]
diff --git a/packages/alsa/alsa.0.2.2/opam b/packages/alsa/alsa.0.2.2/opam
index 5fb9bc45601..d2c6f471f83 100644
--- a/packages/alsa/alsa.0.2.2/opam
+++ b/packages/alsa/alsa.0.2.2/opam
@@ -17,3 +17,4 @@ depexts: [
 ]
 bug-reports: "https://github.com/savonet/ocaml-alsa/issues"
 dev-repo: "https://github.com/savonet/ocaml-alsa.git"
+available: [ ocaml-version < "4.04.0" ]