diff --git a/packages/nocrypto/nocrypto.0.5.4-1/opam b/packages/nocrypto/nocrypto.0.5.4-1/opam
index c880b88dbbb..5bb673ad84e 100644
--- a/packages/nocrypto/nocrypto.0.5.4-1/opam
+++ b/packages/nocrypto/nocrypto.0.5.4-1/opam
@@ -7,7 +7,7 @@ authors:      ["David Kaloper <david@numm.org>"]
 maintainer:   "David Kaloper <david@numm.org>"
 license:      "ISC"
 tags:          [ "org:mirage" ]
-available:     [ ocaml-version >= "4.02.0" ]
+available:     [ ocaml-version >= "4.02.0" & os != "freebsd" & os != "openbsd" ]
 
 build: ["ocaml" "pkg/pkg.ml" "build" "--pinned" "%{pinned}%" "--tests" "false"
                 "--jobs" "1"