diff --git a/pkgs/development/tools/ocaml/oasis/default.nix b/pkgs/development/tools/ocaml/oasis/default.nix
index 4d3536ad6524..38a11db77626 100644
--- a/pkgs/development/tools/ocaml/oasis/default.nix
+++ b/pkgs/development/tools/ocaml/oasis/default.nix
@@ -9,54 +9,57 @@
   ocamlify,
 }:
 
-stdenv.mkDerivation {
-  version = "0.4.11";
-  pname = "ocaml-oasis";
+lib.throwIf (lib.versionAtLeast ocaml.version "5.0") "oasis is not available for OCaml ≥ 5.0"
 
-  src = fetchurl {
-    url = "https://download.ocamlcore.org/oasis/oasis/0.4.11/oasis-0.4.11.tar.gz";
-    hash = "sha256-GLc97vTtbpqDM38ks7vi3tZSaLP/cwn8wA0l5X4dwS4=";
-  };
+  stdenv.mkDerivation
+  {
+    version = "0.4.11";
+    pname = "ocaml-oasis";
 
-  createFindlibDestdir = true;
+    src = fetchurl {
+      url = "https://download.ocamlcore.org/oasis/oasis/0.4.11/oasis-0.4.11.tar.gz";
+      hash = "sha256-GLc97vTtbpqDM38ks7vi3tZSaLP/cwn8wA0l5X4dwS4=";
+    };
 
-  strictDeps = true;
+    createFindlibDestdir = true;
 
-  nativeBuildInputs = [
-    ocaml
-    findlib
-    ocamlbuild
-    ocamlmod
-    ocamlify
-  ];
+    strictDeps = true;
 
-  buildInputs = [ ocamlbuild ];
-
-  configurePhase = ''
-    runHook preConfigure
-    ocaml setup.ml -configure --prefix $out
-    runHook postConfigure
-  '';
-  buildPhase = ''
-    runHook preBuild
-    ocaml setup.ml -build
-    runHook postBuild
-  '';
-  installPhase = ''
-    runHook preInstall
-    ocaml setup.ml -install
-    runHook postInstall
-  '';
-
-  meta = with lib; {
-    description = "Configure, build and install system for OCaml projects";
-    homepage = "https://github.com/ocaml/oasis";
-    license = licenses.lgpl21;
-    maintainers = with maintainers; [
-      vbgl
-      maggesi
+    nativeBuildInputs = [
+      ocaml
+      findlib
+      ocamlbuild
+      ocamlmod
+      ocamlify
     ];
-    mainProgram = "oasis";
-    inherit (ocaml.meta) platforms;
-  };
-}
+
+    buildInputs = [ ocamlbuild ];
+
+    configurePhase = ''
+      runHook preConfigure
+      ocaml setup.ml -configure --prefix $out
+      runHook postConfigure
+    '';
+    buildPhase = ''
+      runHook preBuild
+      ocaml setup.ml -build
+      runHook postBuild
+    '';
+    installPhase = ''
+      runHook preInstall
+      ocaml setup.ml -install
+      runHook postInstall
+    '';
+
+    meta = with lib; {
+      description = "Configure, build and install system for OCaml projects";
+      homepage = "https://github.com/ocaml/oasis";
+      license = licenses.lgpl21;
+      maintainers = with maintainers; [
+        vbgl
+        maggesi
+      ];
+      mainProgram = "oasis";
+      inherit (ocaml.meta) platforms;
+    };
+  }