diff --git a/pkgs/development/tools/ocaml/js_of_ocaml/default.nix b/pkgs/development/tools/ocaml/js_of_ocaml/default.nix
index 0c57ae47c2c8..ca5230d1e086 100644
--- a/pkgs/development/tools/ocaml/js_of_ocaml/default.nix
+++ b/pkgs/development/tools/ocaml/js_of_ocaml/default.nix
@@ -1,18 +1,24 @@
 {stdenv, fetchurl, ocaml, findlib, ocaml_lwt, menhir, ocsigen_deriving, camlp4,
  cmdliner, tyxml, reactivedata, cppo, which, base64}:
 
+let camlp4_patch = fetchurl {
+    url = "https://github.com/FlorentBecker/js_of_ocaml/commit/3b511c5bb777d5049c49d7a04c01f142de7096b9.patch";
+    sha256 = "c92eda8be504cd41eb242166fc815af496243b63d4d21b169f5b62ec5ace2d39";
+    };
+in
+ 
 stdenv.mkDerivation {
   name = "js_of_ocaml-2.6";
   src = fetchurl {
     url = https://github.com/ocsigen/js_of_ocaml/archive/2.6.tar.gz;
     sha256 = "0q34lrn70dvz41m78bwgriyq6dxk97g8gcyg80nvxii4jp86dw61";
     };
-  
+
   buildInputs = [ocaml findlib menhir ocsigen_deriving
                  cmdliner tyxml reactivedata cppo which base64];
   propagatedBuildInputs = [ ocaml_lwt camlp4 ];
 
-  patches = [ ./Makefile.conf.diff ];  
+  patches = [ ./Makefile.conf.diff camlp4_patch ];
 
   createFindlibDestdir = true;