diff --git a/linuxptp.spec b/linuxptp.spec
index 004f2cf..022dd5a 100644
--- a/linuxptp.spec
+++ b/linuxptp.spec
@@ -38,7 +38,7 @@ mv linuxptp-testsuite-%{testsuite_ver}* testsuite
 mv clknetsim-%{clknetsim_ver}* testsuite/clknetsim
 
 %build
-make %{?_smp_mflags} \
+%{make_build} \
 	EXTRA_CFLAGS="$RPM_OPT_FLAGS" \
 	EXTRA_LDFLAGS="$RPM_LD_FLAGS"
 
@@ -61,7 +61,7 @@ echo '.so man8/timemaster.8' > $RPM_BUILD_ROOT%{_mandir}/man5/timemaster.conf.5
 cd testsuite
 # set random seed to get deterministic results
 export CLKNETSIM_RANDOM_SEED=26743
-make %{?_smp_mflags} -C clknetsim
+%{make_build} -C clknetsim
 PATH=..:$PATH ./run
 
 %post