diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index 819dd03d7582..92da02d990d1 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -1316,7 +1316,9 @@ let
 
         monolith = callPackage ../development/ocaml-modules/monolith { };
 
-        mopsa = callPackage ../development/ocaml-modules/mopsa { };
+        mopsa = callPackage ../development/ocaml-modules/mopsa {
+          inherit (pkgs.llvmPackages_19) clang libclang libllvm;
+        };
 
         morbig = callPackage ../development/ocaml-modules/morbig { };