diff --git a/pkgs/development/ocaml-modules/junit/default.nix b/pkgs/development/ocaml-modules/junit/default.nix
index cd33ae2f7f5b..b71712aba999 100644
--- a/pkgs/development/ocaml-modules/junit/default.nix
+++ b/pkgs/development/ocaml-modules/junit/default.nix
@@ -14,12 +14,11 @@ buildDunePackage (rec {
     tyxml
   ];
 
-  duneVersion = "3";
   doCheck = true;
 
   meta = with lib; {
     description = "ocaml-junit is an OCaml package for the creation of JUnit XML reports, proving a typed API to produce valid reports acceptable to Jenkins, comes with packages supporting OUnit and Alcotest.";
-    license = licenses.gpl3;
+    license = licenses.lgpl3Plus;
     maintainers = with maintainers; [ ];
     homepage = "https://github.com/Khady/ocaml-junit";
   };
diff --git a/pkgs/development/ocaml-modules/ptime/default.nix b/pkgs/development/ocaml-modules/ptime/default.nix
index 9c1914b0f322..1f23194582a0 100644
--- a/pkgs/development/ocaml-modules/ptime/default.nix
+++ b/pkgs/development/ocaml-modules/ptime/default.nix
@@ -7,6 +7,9 @@
 , topkg
 }:
 
+lib.throwIfNot (lib.versionAtLeast ocaml.version "4.08")
+  "ptime is not available for OCaml ${ocaml.version}"
+
 stdenv.mkDerivation (finalAttrs: {
   version = "1.1.0";
   pname = "ocaml${ocaml.version}-ptime";
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index cffb020d4684..a53b6e446efd 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -1519,10 +1519,7 @@ let
 
     psq = callPackage ../development/ocaml-modules/psq { };
 
-    ptime =
-      if lib.versionAtLeast ocaml.version "4.08"
-      then callPackage ../development/ocaml-modules/ptime { }
-      else null;
+    ptime = callPackage ../development/ocaml-modules/ptime { };
 
     ptmap = callPackage ../development/ocaml-modules/ptmap { };