diff --git a/nml.spec b/nml.spec
index 13e139f..bda197e 100644
--- a/nml.spec
+++ b/nml.spec
@@ -25,12 +25,11 @@ A tool to compile nml files to grf or nfo files, making newgrf coding easier.
 
 
 %build
-CFLAGS="$RPM_OPT_FLAGS" %{__python3} setup.py build
+%py3_build
 
 
 %install
-rm -rf $RPM_BUILD_ROOT
-%{__python3} setup.py install -O1 --skip-build --root $RPM_BUILD_ROOT
+%py3_install
 
 gzip docs/nmlc.1
 install -Dpm 644 docs/nmlc.1.gz $RPM_BUILD_ROOT%{_mandir}/man1/nmlc.1.gz