diff --git a/pkgs/tools/games/weidu/default.nix b/pkgs/tools/games/weidu/default.nix
index f63e5d41d3fe..580eea067031 100644
--- a/pkgs/tools/games/weidu/default.nix
+++ b/pkgs/tools/games/weidu/default.nix
@@ -12,9 +12,7 @@ let
   # 1. Needs ocaml >= 4.04 and <= 4.11 (patched against 4.14)
   # 2. ocaml 4.10 defaults to safe (immutable) strings so we need a version with
   #    that disabled as weidu is strongly dependent on mutable strings
-  ocaml' = ocaml-ng.ocamlPackages_4_14.ocaml.override {
-    unsafeStringSupport = true;
-  };
+  ocaml' = ocaml-ng.ocamlPackages_4_14_unsafe_string.ocaml;
 
 in
 stdenv.mkDerivation rec {
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 5d7fa20a7195..d86808acf5d9 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -20193,9 +20193,7 @@ with pkgs;
   glpk = callPackage ../development/libraries/glpk { };
 
   glsurf = callPackage ../applications/science/math/glsurf {
-    ocamlPackages = ocaml-ng.mkOcamlPackages (ocaml-ng.ocamlPackages_4_14.ocaml.override {
-      unsafeStringSupport = true;
-    });
+    ocamlPackages = ocaml-ng.ocamlPackages_4_14_unsafe_string;
   };
 
   glui = callPackage ../development/libraries/glui {};
@@ -31564,9 +31562,7 @@ with pkgs;
   mjpg-streamer = callPackage ../applications/video/mjpg-streamer { };
 
   mldonkey = callPackage ../applications/networking/p2p/mldonkey {
-    ocamlPackages = ocaml-ng.mkOcamlPackages (ocaml-ng.ocamlPackages_4_14.ocaml.override {
-      unsafeStringSupport = true;
-    });
+    ocamlPackages = ocaml-ng.ocamlPackages_4_14_unsafe_string;
   };
 
   mlvwm = callPackage ../applications/window-managers/mlvwm { };
@@ -37104,9 +37100,7 @@ with pkgs;
   drat-trim = callPackage ../applications/science/logic/drat-trim {};
 
   ekrhyper = callPackage ../applications/science/logic/ekrhyper {
-    ocaml = ocaml-ng.ocamlPackages_4_14.ocaml.override {
-      unsafeStringSupport = true;
-    };
+    ocaml = ocaml-ng.ocamlPackages_4_14_unsafe_string.ocaml;
   };
 
   eprover = callPackage ../applications/science/logic/eprover { };