diff --git a/mainscripts/Trainer.py b/mainscripts/Trainer.py
index 061b9c6..54234a6 100644
--- a/mainscripts/Trainer.py
+++ b/mainscripts/Trainer.py
@@ -163,7 +163,7 @@ def trainerThread (s2c, c2s, e,
                             model_save()
                             is_reached_goal = True
                             io.log_info ('You can use preview now.')
-                            os._exit(1)
+                            exit(0)
                 
                 need_save = False
                 while time.time() - last_save_time >= save_interval_min*60: