diff --git a/pkgs/development/ocaml-modules/bolt/default.nix b/pkgs/development/ocaml-modules/bolt/default.nix
index 121f484ce419..b5a4f179b17a 100644
--- a/pkgs/development/ocaml-modules/bolt/default.nix
+++ b/pkgs/development/ocaml-modules/bolt/default.nix
@@ -5,6 +5,10 @@ let inherit (stdenv.lib) getVersion versionAtLeast; in
 assert versionAtLeast (getVersion ocaml) "4.00.0";
 assert versionAtLeast (getVersion findlib) "1.3.3";
 
+if versionAtLeast ocaml.version "4.06"
+then throw "bolt is not available for OCaml ${ocaml.version}"
+else
+
 stdenv.mkDerivation rec {
 
   name = "bolt-1.4";