diff --git a/mini_builtin.c b/mini_builtin.c
index 86803e1656..eade34710d 100644
--- a/mini_builtin.c
+++ b/mini_builtin.c
@@ -23,7 +23,20 @@ builtin_iseq_load(const char *feature_name, const struct rb_builtin_function *ta
 
     vm->builtin_function_table = table;
     vm->builtin_inline_index = 0;
-    const rb_iseq_t *iseq = rb_iseq_new(&ast->body, name_str, name_str, Qnil, NULL, ISEQ_TYPE_TOP);
+    static const rb_compile_option_t optimization = {
+	TRUE, /* int inline_const_cache; */
+	TRUE, /* int peephole_optimization; */
+	FALSE,/* int tailcall_optimization; */
+	TRUE, /* int specialized_instruction; */
+	TRUE, /* int operands_unification; */
+	TRUE, /* int instructions_unification; */
+	TRUE, /* int stack_caching; */
+	TRUE, /* int frozen_string_literal; */
+	FALSE, /* int debug_frozen_string_literal; */
+	FALSE, /* unsigned int coverage_enabled; */
+	0, /* int debug_level; */
+    };
+    const rb_iseq_t *iseq = rb_iseq_new_with_opt(&ast->body, name_str, name_str, Qnil, INT2FIX(0), NULL, 0, ISEQ_TYPE_TOP, &optimization);
     GET_VM()->builtin_function_table = NULL;
 
     rb_ast_dispose(ast);