diff --git a/ocaml-findlib.spec b/ocaml-findlib.spec
index 5d01485..fc82495 100644
--- a/ocaml-findlib.spec
+++ b/ocaml-findlib.spec
@@ -1,6 +1,6 @@
 Name:           ocaml-findlib
 Version:        1.8.1
-Release:        3%{?dist}
+Release:        4%{?dist}
 Summary:        Objective CAML package manager and build helper
 License:        BSD
 
@@ -8,7 +8,7 @@ URL:            http://projects.camlcity.org/projects/findlib.html
 Source0:        http://download.camlcity.org/download/findlib-%{version}.tar.gz
 
 BuildRequires:  ocaml >= 4.02.0
-#BuildRequires:  ocaml-camlp4-devel
+BuildRequires:  ocaml-camlp4-devel
 BuildRequires:  ocaml-labltk-devel
 BuildRequires:  ocaml-ocamlbuild-devel
 #BuildRequires:  ocaml-num-devel
@@ -99,6 +99,9 @@ make install \
 
 
 %changelog
+* Mon Sep 02 2019 Richard W.M. Jones <rjones@redhat.com> - 1.8.1-4
+- Rebuild with camlp4.
+
 * Fri Aug 16 2019 Richard W.M. Jones <rjones@redhat.com> - 1.8.1-3
 - OCaml 4.08.1 (final) rebuild.