diff --git a/class.c b/class.c
index 2c66c396ccfed8..edd55f278ef89e 100644
--- a/class.c
+++ b/class.c
@@ -239,7 +239,7 @@ rewrite_cref_stack(NODE *node, VALUE old_klass, VALUE new_klass, NODE **new_cref
     while (node) {
 	if (node->nd_clss == old_klass) {
 	    new_node = NEW_CREF(new_klass);
-	    new_node->nd_next = node->nd_next;
+	    OBJ_WRITE(new_node, &new_node->nd_next, node->nd_next);
 	    *new_cref_ptr = new_node;
 	    return;
 	}
diff --git a/gc.c b/gc.c
index 64c1cf58c3a835..b9b5d3a3baf93f 100644
--- a/gc.c
+++ b/gc.c
@@ -1344,7 +1344,8 @@ rb_newobj_of(VALUE klass, VALUE flags)
 NODE*
 rb_node_newnode(enum node_type type, VALUE a0, VALUE a1, VALUE a2)
 {
-    NODE *n = (NODE *)newobj_of(0, T_NODE, a0, a1, a2);
+    VALUE flags = (RGENGC_WB_PROTECTED_NODE_CREF && type == NODE_CREF ? FL_WB_PROTECTED : 0);
+    NODE *n = (NODE *)newobj_of(0, T_NODE | flags, a0, a1, a2);
     nd_set_type(n, type);
     return n;
 }
diff --git a/include/ruby/ruby.h b/include/ruby/ruby.h
index 05c53fb8386847..9af062ec9412c7 100644
--- a/include/ruby/ruby.h
+++ b/include/ruby/ruby.h
@@ -740,6 +740,9 @@ VALUE rb_obj_setup(VALUE obj, VALUE klass, VALUE type);
 #ifndef RGENGC_WB_PROTECTED_BIGNUM
 #define RGENGC_WB_PROTECTED_BIGNUM 1
 #endif
+#ifndef RGENGC_WB_PROTECTED_NODE_CREF
+#define RGENGC_WB_PROTECTED_NODE_CREF 1
+#endif
 
 struct RBasic {
     VALUE flags;
diff --git a/iseq.c b/iseq.c
index df1c16132f020e..469ae117c8f383 100644
--- a/iseq.c
+++ b/iseq.c
@@ -215,7 +215,7 @@ set_relation(rb_iseq_t *iseq, const VALUE parent)
 	    NODE *cref = NEW_CREF(th->top_wrapper);
 	    cref->nd_refinements = Qnil;
 	    cref->nd_visi = NOEX_PRIVATE;
-	    cref->nd_next = iseq->cref_stack;
+	    OBJ_WRITE(cref, &cref->nd_next, iseq->cref_stack);
 	    ISEQ_SET_CREF(iseq, cref);
 	}
 	iseq->local_iseq = iseq;
@@ -1930,10 +1930,10 @@ rb_iseq_clone(VALUE iseqval, VALUE newcbase)
     }
     if (newcbase) {
 	ISEQ_SET_CREF(iseq1, NEW_CREF(newcbase));
-	iseq1->cref_stack->nd_refinements = iseq0->cref_stack->nd_refinements;
+	OBJ_WRITE(iseq1->cref_stack, &iseq1->cref_stack->nd_refinements, iseq0->cref_stack->nd_refinements);
 	iseq1->cref_stack->nd_visi = iseq0->cref_stack->nd_visi;
 	if (iseq0->cref_stack->nd_next) {
-	    iseq1->cref_stack->nd_next = iseq0->cref_stack->nd_next;
+	    OBJ_WRITE(iseq1->cref_stack, &iseq1->cref_stack->nd_next, iseq0->cref_stack->nd_next);
 	}
 	OBJ_WRITE(iseq1, &iseq1->klass, newcbase);
     }
diff --git a/vm_eval.c b/vm_eval.c
index d3dbf2e5817272..903a6b7f04ebb1 100644
--- a/vm_eval.c
+++ b/vm_eval.c
@@ -1546,7 +1546,7 @@ rb_yield_refine_block(VALUE refinement, VALUE refinements)
     }
     cref = vm_cref_push(th, refinement, NOEX_PUBLIC, blockptr);
     cref->flags |= NODE_FL_CREF_PUSHED_BY_EVAL;
-    cref->nd_refinements = refinements;
+    OBJ_WRITE(cref, &cref->nd_refinements, refinements);
 
     return vm_yield_with_cref(th, 0, NULL, cref);
 }
diff --git a/vm_insnhelper.c b/vm_insnhelper.c
index 05608fd1596a09..28d0ea31c645bf 100644
--- a/vm_insnhelper.c
+++ b/vm_insnhelper.c
@@ -285,10 +285,10 @@ vm_cref_push(rb_thread_t *th, VALUE klass, int noex, rb_block_t *blockptr)
     cref->nd_visi = noex;
 
     if (blockptr) {
-	cref->nd_next = vm_get_cref0(blockptr->iseq, blockptr->ep);
+	OBJ_WRITE(cref, &cref->nd_next, vm_get_cref0(blockptr->iseq, blockptr->ep));
     }
     else if (cfp) {
-	cref->nd_next = vm_get_cref0(cfp->iseq, cfp->ep);
+	OBJ_WRITE(cref, &cref->nd_next, vm_get_cref0(cfp->iseq, cfp->ep));
     }
     /* TODO: why cref->nd_next is 1? */
     if (cref->nd_next && cref->nd_next != (void *) 1 &&
diff --git a/vm_insnhelper.h b/vm_insnhelper.h
index c637407cbc47ab..048fdc4e80cf70 100644
--- a/vm_insnhelper.h
+++ b/vm_insnhelper.h
@@ -174,7 +174,7 @@ enum vm_regan_acttype {
 /**********************************************************/
 
 #define COPY_CREF_OMOD(c1, c2) do {  \
-  (c1)->nd_refinements = (c2)->nd_refinements; \
+  OBJ_WRITE((c1), &(c1)->nd_refinements, (c2)->nd_refinements); \
   if (!NIL_P((c2)->nd_refinements)) { \
       (c1)->flags |= NODE_FL_CREF_OMOD_SHARED; \
       (c2)->flags |= NODE_FL_CREF_OMOD_SHARED; \
@@ -184,9 +184,9 @@ enum vm_regan_acttype {
 #define COPY_CREF(c1, c2) do {  \
   NODE *__tmp_c2 = (c2); \
   COPY_CREF_OMOD(c1, __tmp_c2); \
-  (c1)->nd_clss = __tmp_c2->nd_clss; \
+  OBJ_WRITE((c1), &(c1)->nd_clss, __tmp_c2->nd_clss); \
   (c1)->nd_visi = __tmp_c2->nd_visi;\
-  (c1)->nd_next = __tmp_c2->nd_next; \
+  OBJ_WRITE((c1), &(c1)->nd_next, __tmp_c2->nd_next); \
   if (__tmp_c2->flags & NODE_FL_CREF_PUSHED_BY_EVAL) { \
       (c1)->flags |= NODE_FL_CREF_PUSHED_BY_EVAL; \
   } \