diff --git a/pkgs/development/tools/ocaml/ocaml-top/default.nix b/pkgs/development/tools/ocaml/ocaml-top/default.nix
index 92ad6aa452ea..f5853057d8e0 100644
--- a/pkgs/development/tools/ocaml/ocaml-top/default.nix
+++ b/pkgs/development/tools/ocaml/ocaml-top/default.nix
@@ -4,8 +4,6 @@ with ocamlPackages; buildDunePackage rec {
   pname = "ocaml-top";
   version = "1.2.0-rc";
 
-  useDune2 = true;
-
   src = fetchFromGitHub {
     owner = "OCamlPro";
     repo = "ocaml-top";
@@ -20,6 +18,11 @@ with ocamlPackages; buildDunePackage rec {
     ocp-build -init
   '';
 
+  postPatch = ''
+    substituteInPlace src/completion.ml \
+      --replace 'LibIndex.load ' 'LibIndex.load ~qualify:false '
+  '';
+
   meta = {
     homepage = "https://www.typerex.org/ocaml-top.html";
     license = lib.licenses.gpl3;
diff --git a/pkgs/development/tools/ocaml/ocp-index/default.nix b/pkgs/development/tools/ocaml/ocp-index/default.nix
index b055ccbde5dc..6c315960f985 100644
--- a/pkgs/development/tools/ocaml/ocp-index/default.nix
+++ b/pkgs/development/tools/ocaml/ocp-index/default.nix
@@ -2,15 +2,15 @@
 
 buildDunePackage rec {
   pname = "ocp-index";
-  version = "1.3.3";
+  version = "1.3.4";
 
-  useDune2 = true;
+  minimalOCamlVersion = "4.08";
 
   src = fetchFromGitHub {
     owner = "OCamlPro";
     repo = "ocp-index";
     rev = version;
-    sha256 = "sha256-ElCXjUR85tkyBLIpIKefDouE1upzJytQnk4xoQt/cb0=";
+    sha256 = "sha256-a7SBGHNKUstfrdHx9KI33tYpvzTwIGhs4Hfie5EeKww=";
   };
 
   strictDeps = true;