diff --git a/ocaml-lwt.spec b/ocaml-lwt.spec
index e2d9e7a..2c87c51 100644
--- a/ocaml-lwt.spec
+++ b/ocaml-lwt.spec
@@ -11,6 +11,7 @@ URL:            http://ocsigen.org/lwt
 Source0:        https://github.com/ocsigen/lwt/archive/2.5.0/lwt-2.5.0.tar.gz
 
 BuildRequires:  ocaml >= 3.10.0
+BuildRequires:  ocaml-ocamlbuild
 BuildRequires:  ocaml-findlib-devel
 BuildRequires:  ocaml-ocamldoc
 BuildRequires:  ocaml-camlp4-devel
@@ -95,6 +96,7 @@ OCAMLPATH=$RPM_BUILD_ROOT%{_libdir}/ocaml ocamlfind query lwt.react
 %changelog
 * Mon Nov 07 2016 Richard W.M. Jones <rjones@redhat.com> - 2.5.0-6
 - Rebuild for OCaml 4.04.0.
+- Add explicit dependency on ocamlbuild.
 
 * Thu Feb 04 2016 Fedora Release Engineering <releng@fedoraproject.org> - 2.5.0-5
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_24_Mass_Rebuild