diff --git a/src/ui/gunicorn.conf.py b/src/ui/gunicorn.conf.py
index 8f53f7a83..f14ea0d45 100644
--- a/src/ui/gunicorn.conf.py
+++ b/src/ui/gunicorn.conf.py
@@ -134,3 +134,4 @@ def when_ready(server):
 def on_exit(server):
     RUN_DIR.joinpath("ui.pid").unlink(missing_ok=True)
     TMP_DIR.joinpath("ui.healthy").unlink(missing_ok=True)
+    TMP_DIR.joinpath(".flask_secret").unlink(missing_ok=True)