1 files changed, 3 insertions, 1 deletions
diff --git a/eval.c b/eval.c
index c6b6aad8b4..6d6eb55426 100644
--- a/eval.c
+++ b/eval.c
@@ -1099,7 +1099,9 @@ rb_using_refinement(NODE *cref, VALUE klass, VALUE module)
     FL_SET(module, RMODULE_IS_OVERLAID);
     c = iclass = rb_include_class_new(module, superclass);
     RCLASS_REFINED_CLASS(c) = klass;
-    RCLASS_M_TBL(c) = RCLASS_M_TBL(module);
+
+    RCLASS_M_TBL(OBJ_WB_GIVEUP(c)) = RCLASS_M_TBL(OBJ_WB_GIVEUP(module));
+
     module = RCLASS_SUPER(module);
     while (module && module != klass) {
 	FL_SET(module, RMODULE_IS_OVERLAID);