diff --git a/ocaml-xmlm.spec b/ocaml-xmlm.spec
index cd543de..fca1eeb 100644
--- a/ocaml-xmlm.spec
+++ b/ocaml-xmlm.spec
@@ -19,6 +19,7 @@ Source2:        test-invalid.xml
 
 BuildRequires:  ocaml >= 3.10.0
 BuildRequires:  ocaml-findlib
+BuildRequires:  ocaml-ocamlbuild
 
 %if 0%{?epel}
 ExcludeArch:   ppc64
@@ -109,6 +110,7 @@ grep expected invalid-err.log >/dev/null
 %changelog
 * Tue Apr 17 2018 Richard W.M. Jones <rjones@redhat.com> - 1.2.0-17
 - Rebuild for OCaml 4.05 in RHEL 7.5 (RHBZ#1568359)
+- Add explicit dependency on ocamlbuild.
 
 * Tue Sep 29 2015 Ding-Yi Chen <dchen@redhat.com> - 1.2.0-16
 - Exclude ppc64 for EPEL, as ocaml-findlib is not available on it.