diff --git a/pkgs/development/ocaml-modules/lwt/default.nix b/pkgs/development/ocaml-modules/lwt/default.nix
index 345ca037fec9..739e6e1e43a8 100644
--- a/pkgs/development/ocaml-modules/lwt/default.nix
+++ b/pkgs/development/ocaml-modules/lwt/default.nix
@@ -1,7 +1,7 @@
 { stdenv, fetchzip, pkgconfig, ncurses, libev, jbuilder
 , ocaml, findlib, cppo
 , ocaml-migrate-parsetree, ppx_tools_versioned, result
-, withP4 ? !stdenv.lib.versionAtLeast ocaml.version "4.07"
+, withP4 ? true
 , camlp4 ? null
 }:
 
diff --git a/pkgs/development/ocaml-modules/tyxml/default.nix b/pkgs/development/ocaml-modules/tyxml/default.nix
index b34c9279c307..a38040e6e1fe 100644
--- a/pkgs/development/ocaml-modules/tyxml/default.nix
+++ b/pkgs/development/ocaml-modules/tyxml/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchzip, ocaml, findlib, ocamlbuild, uutf, markup, ppx_tools_versioned, re
-, withP4 ? !stdenv.lib.versionAtLeast ocaml.version "4.07"
+, withP4 ? true
 , camlp4 ? null
 }: