diff --git a/ocaml-fileutils.spec b/ocaml-fileutils.spec
index 610dcfe..7325504 100644
--- a/ocaml-fileutils.spec
+++ b/ocaml-fileutils.spec
@@ -28,6 +28,7 @@ Source0:        ocaml-fileutils-%{version}.tar.xz
 BuildRequires:  ocaml >= 4.00.1
 BuildRequires:  ocaml-rpm-macros >= 4.02.1
 BuildRequires:  ocamlfind(str)
+BuildRequires:  ocamlfind(unix)
 BuildRequires:  ocaml-oasis
 BuildRequires:  ocaml-ocamldoc
 BuildRoot:      %{_tmppath}/%{name}-%{version}-build