diff --git a/compsize.spec b/compsize.spec
index cb3d0ee..d7931b8 100644
--- a/compsize.spec
+++ b/compsize.spec
@@ -1,6 +1,6 @@
 Name:           compsize
 Version:        1.3
-Release:        3%{?dist}
+Release:        4%{?dist}
 Summary:        Utility for measuring compression ratio of files on btrfs
 License:        GPLv2+
 URL:            https://github.com/kilobyte/compsize
@@ -17,9 +17,7 @@ a report.
 %autosetup
 
 %build
-export CFLAGS="%{optflags}"
-export CXXFLAGS="%{optflags}"
-export LDFLAGS="%{__global_ldflags}"
+%set_build_flags
 %make_build
 
 %install
@@ -33,6 +31,9 @@ install -D -m 0644 %{name}.8 %{buildroot}%{_mandir}/man8/%{name}.8
 %{_mandir}/man8/%{name}.8*
 
 %changelog
+* Thu Aug 06 2020 Juan Orti Alcaine <jortialc@redhat.com> - 1.3-4
+- Use set_build_flags macro
+
 * Mon Jul 27 2020 Fedora Release Engineering <releng@fedoraproject.org> - 1.3-3
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_33_Mass_Rebuild