1 files changed, 2 insertions, 2 deletions
diff --git a/vm.c b/vm.c
index ac86401c3d..03057bef1c 100644
--- a/vm.c
+++ b/vm.c
@@ -2258,8 +2258,8 @@ Init_VM(void)
     rb_define_method_id(klass, id_core_hash_merge_ary, m_core_hash_merge_ary, 2);
     rb_define_method_id(klass, id_core_hash_merge_ptr, m_core_hash_merge_ptr, -1);
     rb_define_method_id(klass, id_core_hash_merge_kwd, m_core_hash_merge_kwd, 2);
-    rb_define_method(klass, "proc", rb_block_proc, 0);
-    rb_define_method(klass, "lambda", rb_block_lambda, 0);
+    rb_define_method_id(klass, idProc, rb_block_proc, 0);
+    rb_define_method_id(klass, idLambda, rb_block_lambda, 0);
     rb_obj_freeze(fcore);
     rb_gc_register_mark_object(fcore);
     rb_mRubyVMFrozenCore = fcore;