diff --git a/hiboo/cli.py b/hiboo/cli.py
index 2a401b3c308fef15804b0e3dd1da11f5425b1bf1..af25cc11853b966d9c7c6a422cfec71e202fdf6a 100644
--- a/hiboo/cli.py
+++ b/hiboo/cli.py
@@ -22,4 +22,5 @@ def tasks_loop():
     """
     while True:
         common.apply_all_transitions()
+        models.User.delete_unused()
         time.sleep(30)