1 files changed, 1 insertions, 1 deletions
diff --git a/vm.c b/vm.c
index fababaa2ec..88a7ef39fa 100644
--- a/vm.c
+++ b/vm.c
@@ -340,7 +340,7 @@ rb_event_flag_t ruby_vm_event_flags;
 rb_event_flag_t ruby_vm_event_enabled_flags;
 rb_serial_t ruby_vm_global_method_state = 1;
 rb_serial_t ruby_vm_global_constant_state = 1;
-rb_serial_t ruby_vm_class_serial = 1;
+rb_serial_t ruby_vm_class_serial = RUBY_VM_CLASS_SERIAL_MIN_VALID_VALUE;
 
 static void thread_free(void *ptr);