diff --git a/ocaml-menhir.spec b/ocaml-menhir.spec
index a5ec70b..ddfc296 100644
--- a/ocaml-menhir.spec
+++ b/ocaml-menhir.spec
@@ -52,7 +52,7 @@ developing applications that use %{name}.
 %build
 o=
 make \
-%if %{defined ocaml_native_compiler}
+%if 0%{?ocaml_native_compiler}
 	TARGET=native \
 %else
 	TARGET=byte \
@@ -67,7 +67,7 @@ OCAMLFIND_DESTDIR=%{buildroot}`ocamlc -where`
 mkdir -vp ${OCAMLFIND_DESTDIR}
 make \
 	install \
-%if %{defined ocaml_native_compiler}
+%if 0%{?ocaml_native_compiler}
 	TARGET=native \
 %else
 	TARGET=byte \
@@ -86,7 +86,7 @@ rm -rfv %{buildroot}/usr/share/doc
 %dir %{_libdir}/ocaml
 %dir %{_libdir}/ocaml/*
 %{_libdir}/ocaml/*/META
-%if %{defined ocaml_native_compiler}
+%if 0%{?ocaml_native_compiler}
 %{_libdir}/ocaml/*/*.o
 %endif
 %{_libdir}/ocaml/*/*.cmi
@@ -98,7 +98,7 @@ rm -rfv %{buildroot}/usr/share/doc
 %{_mandir}/*/*
 %dir %{_libdir}/ocaml
 %dir %{_libdir}/ocaml/*
-%if %{defined ocaml_native_compiler}
+%if 0%{?ocaml_native_compiler}
 %{_libdir}/ocaml/*/*.cmx
 %endif
 %{_libdir}/ocaml/*/*.mli