diff --git a/autoconf.spec b/autoconf.spec
index d9afa03..2b6ada6 100644
--- a/autoconf.spec
+++ b/autoconf.spec
@@ -71,18 +71,17 @@ their use.
 
 %build
 %configure --with-lispdir=%{_emacs_sitelispdir}/autoconf
-# not parallel safe
-make
+make %{?_smp_mflags}
 
 %check
 %if %{with check}
 # make check # TESTSUITEFLAGS='1-198 200-' # will disable nr. 199.
 # make check TESTSUITEFLAGS="-k \!erlang"
-make check
+make check %{?_smp_mflags}
 %endif
 
 %install
-make install DESTDIR=%{buildroot}
+make install %{?_smp_mflags} DESTDIR=%{buildroot}
 mkdir -p %{buildroot}/share
 install -m 0644 %{SOURCE1} %{buildroot}%{_datadir}