diff --git a/ocaml-tplib.spec b/ocaml-tplib.spec
index 7344049..0220d46 100644
--- a/ocaml-tplib.spec
+++ b/ocaml-tplib.spec
@@ -22,6 +22,7 @@ Source6:        compute_tropical_complex.1
 Patch0:         %{name}-ocamlbuild.patch
 
 BuildRequires:  ocaml
+BuildRequires:  ocaml-ocamlbuild
 BuildRequires:  ocaml-camlidl-devel
 BuildRequires:  ocaml-findlib-devel
 BuildRequires:  ocaml-ocamldoc
@@ -105,6 +106,7 @@ _build/tests/test_tplib_rational
 %changelog
 * Mon Nov 07 2016 Richard W.M. Jones <rjones@redhat.com> - 1.3-22
 - Rebuild for OCaml 4.04.0.
+- Add explicit dependency on ocamlbuild.
 
 * Thu Feb 04 2016 Fedora Release Engineering <releng@fedoraproject.org> - 1.3-21
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_24_Mass_Rebuild