diff --git a/pkgs/development/ocaml-modules/sexplib/108.08.00.nix b/pkgs/development/ocaml-modules/sexplib/108.08.00.nix
index a8acee1c5388..685f2afb0b46 100644
--- a/pkgs/development/ocaml-modules/sexplib/108.08.00.nix
+++ b/pkgs/development/ocaml-modules/sexplib/108.08.00.nix
@@ -1,6 +1,8 @@
 {stdenv, fetchurl, ocaml, findlib, type_conv, camlp4}:
 
-assert stdenv.lib.versionOlder "3.12" ocaml.version;
+if !stdenv.lib.versionAtLeast ocaml.version "3.12"
+|| stdenv.lib.versionAtLeast ocaml.version "4.03"
+then throw "sexlib-108.08.00 is not available for OCaml ${ocaml.version}" else
 
 stdenv.mkDerivation {
   name = "ocaml-sexplib-108.08.00";
diff --git a/pkgs/development/ocaml-modules/sexplib/111.25.00.nix b/pkgs/development/ocaml-modules/sexplib/111.25.00.nix
index a8724f23cfe8..e98a2ecdb30e 100644
--- a/pkgs/development/ocaml-modules/sexplib/111.25.00.nix
+++ b/pkgs/development/ocaml-modules/sexplib/111.25.00.nix
@@ -1,6 +1,9 @@
 {stdenv, fetchurl, ocaml, findlib, type_conv, camlp4}:
 
-assert stdenv.lib.versionOlder "4.00" ocaml.version;
+if !stdenv.lib.versionAtLeast ocaml.version "4.00"
+|| stdenv.lib.versionAtLeast ocaml.version "4.03"
+then throw "sexlib-111.25.00 is not available for OCaml ${ocaml.version}" else
+
 
 stdenv.mkDerivation {
   name = "ocaml-sexplib-111.25.00";
diff --git a/pkgs/development/ocaml-modules/sexplib/112.24.01.nix b/pkgs/development/ocaml-modules/sexplib/112.24.01.nix
index b63b5af05e82..24cdb497189e 100644
--- a/pkgs/development/ocaml-modules/sexplib/112.24.01.nix
+++ b/pkgs/development/ocaml-modules/sexplib/112.24.01.nix
@@ -1,4 +1,8 @@
-{stdenv, buildOcaml, fetchurl, type_conv, camlp4}:
+{ stdenv, buildOcaml, fetchurl, ocaml, type_conv, camlp4 }:
+
+if !stdenv.lib.versionAtLeast ocaml.version "4.02"
+|| stdenv.lib.versionAtLeast ocaml.version "4.03"
+then throw "sexlib-112.24.01 is not available for OCaml ${ocaml.version}" else
 
 buildOcaml rec {
   minimumSupportedOcamlVersion = "4.02";