diff --git a/srcpkgs/pfff/template b/srcpkgs/pfff/template
index 1d8dc12686a..49a7a3704f3 100644
--- a/srcpkgs/pfff/template
+++ b/srcpkgs/pfff/template
@@ -1,7 +1,7 @@
 # Template build file for 'pfff'
 pkgname=pfff
 version=0.29
-revision=2
+revision=3
 build_style=configure
 configure_args="--prefix=/usr"
 short_desc="Tools and APIs for code analysis, visualization and transformation"
@@ -10,10 +10,11 @@ license="LGPL-2.1"
 homepage="https://github.com/facebook/pfff"
 distfiles="$homepage/archive/v${version}.tar.gz"
 checksum="d31c68f1ebb1770297eb26441d21d83728c0fbdb9c7bb3be27625db45fae72d1"
-makedepends="perl ocaml ocaml-findlib camlp4 zlib-devel ncurses-devel"
+makedepends="perl ocaml ocaml-findlib ocaml-num camlp4 zlib-devel ncurses-devel"
 depends="ocaml"
-nocross="yes"
-nostrip="yes"
+nocross=yes
+nostrip=yes
+export OCAMLPARAM="safe-string=0,_"
 
 post_extract() {
 	sed -i s/uint32/uint32_t/g external/ocamlzip/zlibstubs.c