diff --git a/bin/melc.ml b/bin/melc.ml
index d011f64f4..72029367d 100644
--- a/bin/melc.ml
+++ b/bin/melc.ml
@@ -279,8 +279,12 @@ let main: Melc_cli.t -> _ Cmdliner.Term.ret
       (* The OCaml compiler expects include_dirs in reverse CLI order, but
          cmdliner returns it in CLI order. *)
       List.rev_append include_dirs !Clflags.include_dirs;
+#if OCAML_VERSION >= (5,2,0)
     Clflags.hidden_include_dirs :=
       List.rev_append hidden_include_dirs !Clflags.hidden_include_dirs;
+#else
+    let _hidden_include_dirs = hidden_include_dirs in
+#endif
 
     List.iter ~f:Warnings.parse_alert_option alerts;
 
diff --git a/jscomp/core/record_attributes_check.cppo.ml b/jscomp/core/record_attributes_check.cppo.ml
index 88b5e1588..a38e5ca83 100644
--- a/jscomp/core/record_attributes_check.cppo.ml
+++ b/jscomp/core/record_attributes_check.cppo.ml
@@ -52,7 +52,13 @@ let process_tag_name attrs =
                   };
                 ] -> (
                 namespace_error ~loc txt;
-                match const.pconst_desc with
+                match
+#if OCAML_VERSION >= (5, 3, 0)
+                  const.pconst_desc
+#else
+                  const
+#endif
+                with
                 | Pconst_string (s, _, _) -> st := Some s
                 | _ -> ())
             | _ -> ());
diff --git a/nix/shell.nix b/nix/shell.nix
index e0c5341d6..1745d4983 100644
--- a/nix/shell.nix
+++ b/nix/shell.nix
@@ -10,7 +10,6 @@
 , git
 , python3
 , nodePackages
-, pkgs
 , release-mode ? false
 }:
 
@@ -21,7 +20,7 @@ in
 mkShell {
   inputsFrom = lib.attrValues derivations;
   nativeBuildInputs = with ocamlPackages; [
-    pkgs.ocaml-ng.ocamlPackages_5_2.ocamlformat
+    ocamlformat
     utop
     ocaml-lsp
     merlin