diff --git a/pkgs/development/ocaml-modules/lambda-term/default.nix b/pkgs/development/ocaml-modules/lambda-term/default.nix
index b6edadb0b14b..1baea569dbde 100644
--- a/pkgs/development/ocaml-modules/lambda-term/default.nix
+++ b/pkgs/development/ocaml-modules/lambda-term/default.nix
@@ -1,4 +1,4 @@
-{stdenv, fetchurl, libev, ocaml, findlib, ocaml_lwt, ocaml_react, zed}:
+{ stdenv, fetchurl, libev, ocaml, findlib, ocaml_lwt, ocaml_react, zed, camlp4 }:
 
 stdenv.mkDerivation rec {
   version = "1.6";
@@ -11,7 +11,7 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ libev ocaml findlib ocaml_lwt ocaml_react ];
 
-  propagatedBuildInputs = [ zed ];
+  propagatedBuildInputs = [ camlp4 zed ];
 
   createFindlibDestdir = true;