diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 7a26b8ba9f97..38b9354e6cac 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -39938,7 +39938,9 @@ with pkgs;
     perl = perl536;
   };
 
-  megam = callPackage ../applications/science/misc/megam { };
+  megam = callPackage ../applications/science/misc/megam {
+    inherit (ocaml-ng.ocamlPackages_4_14) ocaml;
+  };
 
   netlogo = callPackage ../applications/science/misc/netlogo { };