1 files changed, 6 insertions, 0 deletions
diff --git a/id.c b/id.c
index 0226a9f5aa..5e3072dcba 100644
--- a/id.c
+++ b/id.c
@@ -68,4 +68,10 @@ Init_id(void)
 
     idRespond_to = rb_intern("respond_to?");
     idInitialize = rb_intern("initialize");
+
+    id_core_set_method_alias = rb_intern("core_set_method_alias");
+    id_core_set_variable_alias = rb_intern("core_set_variable_alias");
+    id_core_undef_method = rb_intern("core_undef_method");
+    id_core_define_method = rb_intern("core_define_method");
+    id_core_define_singleton_method = rb_intern("core_define_singleton_method");
 }