diff --git a/openvdb.spec b/openvdb.spec
index 4848113..72e02cb 100644
--- a/openvdb.spec
+++ b/openvdb.spec
@@ -112,6 +112,11 @@ sed -i \
 # https://bugzilla.redhat.com/show_bug.cgi?id=2021376
 %global optflags %(echo %{optflags} | sed 's/-g /-g1 /')
 %endif
+%if 0%{?rhel}
+%ifarch ppc64le s390x
+%undefine _smp_mflags
+%endif
+%endif
 export CXXFLAGS="%{build_cxxflags} -Wl,--as-needed"
 
 # Ignore versions (python 3, etc.)