1 files changed, 2 insertions, 2 deletions
diff --git a/src/kernel.c b/src/kernel.c
index 62e1bee09..7ff94c1d9 100644
--- a/src/kernel.c
+++ b/src/kernel.c
@@ -317,7 +317,7 @@ mrb_obj_clone(mrb_state *mrb, mrb_value self)
   struct RObject *p;
   mrb_value clone;
 
-  if (mrb_special_const_p(self)) {
+  if (mrb_immediate_p(self)) {
     mrb_raisef(mrb, E_TYPE_ERROR, "can't clone %S", self);
   }
   p = (struct RObject*)mrb_obj_alloc(mrb, mrb_type(self), mrb_obj_class(mrb, self));
@@ -353,7 +353,7 @@ mrb_obj_dup(mrb_state *mrb, mrb_value obj)
   struct RBasic *p;
   mrb_value dup;
 
-  if (mrb_special_const_p(obj)) {
+  if (mrb_immediate_p(obj)) {
     mrb_raisef(mrb, E_TYPE_ERROR, "can't dup %S", obj);
   }
   p = mrb_obj_alloc(mrb, mrb_type(obj), mrb_obj_class(mrb, obj));