1 files changed, 2 insertions, 0 deletions
diff --git a/class.c b/class.c
index 39899d5e05..b41e1a37e8 100644
--- a/class.c
+++ b/class.c
@@ -567,6 +567,8 @@ rb_mod_init_copy(VALUE clone, VALUE orig)
         else {
             rb_bug("no origin for class that has origin");
         }
+
+        rb_class_update_superclasses(clone);
     }
 
     return clone;