diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index cf0241f64c2b..20d3e0a3da39 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -15688,7 +15688,9 @@ with pkgs;
 
   coffeescript = callPackage ../development/compilers/coffeescript { };
 
-  comby = callPackage ../development/tools/comby { };
+  comby = callPackage ../development/tools/comby {
+    ocamlPackages = ocaml-ng.ocamlPackages_4_14;
+  };
 
   inherit (coqPackages_8_17) compcert;