diff --git a/ocaml-gsl.spec b/ocaml-gsl.spec
index a34d96c..ec31433 100644
--- a/ocaml-gsl.spec
+++ b/ocaml-gsl.spec
@@ -18,6 +18,7 @@ Source0:        https://github.com/mmottl/gsl-ocaml/releases/download/v%{version
 
 
 BuildRequires:  ocaml >= 3.07
+BuildRequires:  ocaml-ocamlbuild
 BuildRequires:  ocaml-findlib-devel
 BuildRequires:  ocaml-ocamldoc
 BuildRequires:  ocaml-camlp4-devel
@@ -84,6 +85,7 @@ make install
 %changelog
 * Mon Nov 07 2016 Richard W.M. Jones <rjones@redhat.com> - 1.19.1-1
 - New upstream version 1.19.1.
+- Add explicit dependency on ocamlbuild.
 
 * Mon Feb 22 2016 Orion Poplawski <orion@cora.nwra.com> - 1.19.0-3
 - Rebuild for gsl 2.1