diff --git a/ocaml-findlib.spec b/ocaml-findlib.spec
index 576d8b6..c286da2 100644
--- a/ocaml-findlib.spec
+++ b/ocaml-findlib.spec
@@ -88,7 +88,7 @@ tools/extract_args/extract_args -o src/findlib/ocaml_args.ml ocamlc ocamlcp ocam
   -mandir %{_mandir} \
   -with-toolbox
 make all
-%if %{defined ocaml_native_compiler}
+%if 0%{?ocaml_native_compiler}
 make opt
 %endif
 rm doc/guide-html/TIMESTAMP
@@ -130,7 +130,7 @@ rm -rfv $RPM_BUILD_ROOT%{_libdir}/ocaml/ocamlbuild
 #
 %{_libdir}/ocaml/topfind
 %dir %{_libdir}/ocaml/findlib
-%if %{defined ocaml_native_compiler}
+%if 0%{?ocaml_native_compiler}
 %{_libdir}/ocaml/*/*.cmxs
 %endif
 
@@ -144,7 +144,7 @@ rm -rfv $RPM_BUILD_ROOT%{_libdir}/ocaml/ocamlbuild
 %dir %{_libdir}/ocaml/num-top
 %{_libdir}/ocaml/findlib/META
 %{_libdir}/ocaml/num-top/META
-%if %{defined ocaml_native_compiler}
+%if 0%{?ocaml_native_compiler}
 %{_libdir}/ocaml/*/*.a
 %{_libdir}/ocaml/*/*.cmxa
 %endif