diff --git a/ocaml-camomile.spec b/ocaml-camomile.spec
index 3014243..937abd3 100644
--- a/ocaml-camomile.spec
+++ b/ocaml-camomile.spec
@@ -22,6 +22,7 @@ BuildRequires:  ocaml >= 3.12.1-12
 BuildRequires:  ocaml-findlib-devel
 BuildRequires:  ocaml-ocamldoc
 BuildRequires:  ocaml-camlp4-devel
+BuildRequires:  ocaml-cppo
 
 # While we are building from git pre-releases we must run autoconf.
 BuildRequires:  autoconf
@@ -127,6 +128,7 @@ cp tools/camomilelocaledef.opt $RPM_BUILD_ROOT%{_bindir}/camomilelocaledef
 - OCaml 4.05.0 rebuild.
 - Use ocaml_native_compiler instead of opt.
 - Do not disable debuginfo.
+- Add new BR ocaml-cppo.
 
 * Thu Aug 03 2017 Fedora Release Engineering <releng@fedoraproject.org> - 0.8.5-23
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_27_Binutils_Mass_Rebuild