diff --git a/src/class.c b/src/class.c
index a07cdbce5..a2e0d0fc8 100644
--- a/src/class.c
+++ b/src/class.c
@@ -3038,11 +3038,11 @@ mrb_init_class(mrb_state *mrb)
   mrb_define_private_method_id(mrb, bob, MRB_SYM(singleton_method_added),  mrb_do_nothing,           MRB_ARGS_REQ(1));
   mrb_define_private_method_id(mrb, bob, MRB_SYM(method_missing),          mrb_obj_missing,          MRB_ARGS_ANY());  /* 15.3.1.3.30 */
 
-  mrb_define_class_method_id(mrb, cls, MRB_SYM(new),               mrb_class_new_class,      MRB_ARGS_OPT(1)|MRB_ARGS_BLOCK());
-  mrb_define_method_id(mrb, cls, MRB_SYM(allocate),                mrb_instance_alloc,       MRB_ARGS_NONE());
-  mrb_define_method_id(mrb, cls, MRB_SYM(superclass),              mrb_class_superclass,     MRB_ARGS_NONE()); /* 15.2.3.3.4 */
-  mrb_define_method_id(mrb, cls, MRB_SYM(initialize),              mrb_class_initialize,     MRB_ARGS_OPT(1)); /* 15.2.3.3.1 */
-  mrb_define_method_id(mrb, cls, MRB_SYM(inherited),               mrb_do_nothing,           MRB_ARGS_REQ(1));
+  mrb_define_class_method_id(mrb, cls, MRB_SYM(new),                       mrb_class_new_class,      MRB_ARGS_OPT(1)|MRB_ARGS_BLOCK());
+  mrb_define_method_id(mrb, cls, MRB_SYM(allocate),                        mrb_instance_alloc,       MRB_ARGS_NONE());
+  mrb_define_method_id(mrb, cls, MRB_SYM(superclass),                      mrb_class_superclass,     MRB_ARGS_NONE()); /* 15.2.3.3.4 */
+  mrb_define_private_method_id(mrb, cls, MRB_SYM(initialize),              mrb_class_initialize,     MRB_ARGS_OPT(1)); /* 15.2.3.3.1 */
+  mrb_define_private_method_id(mrb, cls, MRB_SYM(inherited),               mrb_do_nothing,           MRB_ARGS_REQ(1));
 
   init_class_new(mrb, cls);