--- a/src/hotspot/cpu/ppc/gc/g1/g1BarrierSetAssembler_ppc.cpp	Fri Jun 15 13:08:32 2018 -0700
+++ b/src/hotspot/cpu/ppc/gc/g1/g1BarrierSetAssembler_ppc.cpp	Fri Jun 15 16:53:58 2018 -0400
@@ -335,7 +335,7 @@
 
   __ beq(CCR0, not_weak);     // Test for jweak tag.
   __ verify_oop(value);
-  g1_write_barrier_pre(masm, IN_ROOT | ON_PHANTOM_OOP_REF,
+  g1_write_barrier_pre(masm, IN_NATIVE | ON_PHANTOM_OOP_REF,
                        noreg, noreg, value,
                        tmp1, tmp2, needs_frame);
   __ bind(not_weak);