diff --git a/pkgs/build-support/ocaml/dune.nix b/pkgs/build-support/ocaml/dune.nix
index f9f59b21510..56fe8a60484 100644
--- a/pkgs/build-support/ocaml/dune.nix
+++ b/pkgs/build-support/ocaml/dune.nix
@@ -1,8 +1,8 @@
-{ lib, stdenv, ocaml, findlib, dune, dune_2 }:
+{ lib, stdenv, ocaml, findlib, dune_1, dune_2 }:
 
 { pname, version, buildInputs ? [], enableParallelBuilding ? true, ... }@args:
 
-let Dune = if args.useDune2 or false then dune_2 else dune; in
+let Dune = if args.useDune2 or false then dune_2 else dune_1; in
 
 if args ? minimumOCamlVersion &&
    ! lib.versionAtLeast ocaml.version args.minimumOCamlVersion
diff --git a/pkgs/development/tools/ocaml/dune/default.nix b/pkgs/development/tools/ocaml/dune/1.nix
similarity index 100%
rename from pkgs/development/tools/ocaml/dune/default.nix
rename to pkgs/development/tools/ocaml/dune/1.nix
diff --git a/pkgs/top-level/aliases.nix b/pkgs/top-level/aliases.nix
index f767f22c1f6..cd6418e1e81 100644
--- a/pkgs/top-level/aliases.nix
+++ b/pkgs/top-level/aliases.nix
@@ -293,7 +293,7 @@ mapAliases ({
   i-score = throw "i-score has been removed: abandoned upstream."; # added 2020-11-21
   jamomacore = throw "jamomacore has been removed: abandoned upstream."; # added 2020-11-21
   jasper = throw "jasper has been removed: abandoned upstream with many vulnerabilities";
-  jbuilder = dune; # added 2018-09-09
+  jbuilder = dune_1; # added 2018-09-09
   jikes = throw "jikes was deprecated on 2019-10-07: abandoned by upstream";
   joseki = apache-jena-fuseki; # added 2016-02-28
   json_glib = json-glib; # added 2018-02-25
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index f53245544e8..b726c4f87ba 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -2220,7 +2220,7 @@ in
 
   duf = callPackage ../tools/misc/duf { };
 
-  inherit (ocamlPackages) dune dune_2 dune-release;
+  inherit (ocamlPackages) dune_1 dune_2 dune-release;
 
   duperemove = callPackage ../tools/filesystems/duperemove { };
 
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index 51dd6c257b2..f31125ef82f 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -276,7 +276,7 @@ let
 
     dum = callPackage ../development/ocaml-modules/dum { };
 
-    dune = callPackage ../development/tools/ocaml/dune { };
+    dune_1 = callPackage ../development/tools/ocaml/dune/1.nix { };
 
     dune_2 =
       if lib.versionAtLeast ocaml.version "4.08"