1 files changed, 1 insertions, 1 deletions
diff --git a/object.c b/object.c
index e15d89f99b..44cab14521 100644
--- a/object.c
+++ b/object.c
@@ -1800,7 +1800,7 @@ rb_obj_alloc(VALUE klass)
 static VALUE
 rb_class_allocate_instance(VALUE klass)
 {
-    NEWOBJ_OF(obj, struct RObject, klass, T_OBJECT);
+    NEWOBJ_OF(obj, struct RObject, klass, T_OBJECT | (RGENGC_WB_PROTECTED_OBJECT ? FL_WB_PROTECTED : 0));
     return (VALUE)obj;
 }