diff --git a/ocaml-ocamlbuild.spec b/ocaml-ocamlbuild.spec
index 6f057a8..a76b352 100644
--- a/ocaml-ocamlbuild.spec
+++ b/ocaml-ocamlbuild.spec
@@ -4,7 +4,7 @@
 
 Name:          ocaml-ocamlbuild
 Version:       0.11.0
-Release:       4%{?dist}
+Release:       5%{?dist}
 
 Summary:       Build tool for OCaml libraries and programs
 
@@ -53,7 +53,9 @@ make configure \
   OCAML_NATIVE=false
 %endif
 
-make %{?_smp_mflags}
+make %{?_smp_mflags} \
+     OCAMLC="ocamlc.opt -g" \
+     OCAMLOPT="ocamlopt.opt -g"
 
 
 %install
@@ -106,6 +108,9 @@ rm $RPM_BUILD_ROOT%{_libdir}/ocaml/ocamlbuild/META
 
 
 %changelog
+* Mon Jul 31 2017 Richard W.M. Jones <rjones@redhat.com> - 0.11.0-5
+- Enable debug symbols (-g).
+
 * Thu Jul 27 2017 Fedora Release Engineering <releng@fedoraproject.org> - 0.11.0-4
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_27_Mass_Rebuild