1 files changed, 1 insertions, 2 deletions
diff --git a/vm.c b/vm.c
index f62e423b88..9ce0a8e713 100644
--- a/vm.c
+++ b/vm.c
@@ -2449,8 +2449,7 @@ Init_VM(void)
     rb_cBacktrace = rb_define_class_under(rb_cRubyVM, "Backtrace", rb_cObject);
     rb_define_alloc_func(rb_cBacktrace, backtrace_alloc);
     rb_undef_method(CLASS_OF(rb_cBacktrace), "new");
-    rb_define_method(rb_cBacktrace, "_dump_data", backtrace_dump_data, 0);
-    rb_define_method(rb_cBacktrace, "_load_data", backtrace_load_data, 1);
+    rb_marshal_define_compat(rb_cBacktrace, rb_cArray, backtrace_dump_data, backtrace_load_data);
 
     /* ::RubyVM::USAGE_ANALYSIS_* */
     rb_define_const(rb_cRubyVM, "USAGE_ANALYSIS_INSN", rb_hash_new());