diff --git a/start.py b/start.py
index 2ed0ca4..6471e56 100644
--- a/start.py
+++ b/start.py
@@ -20,6 +20,10 @@ import threading
 import time
 import pathlib
 
+# Flush prints line-by-line so the tunnel URL etc. show up promptly in
+# systemd journals (stdout is block-buffered when not connected to a TTY).
+sys.stdout.reconfigure(line_buffering=True)
+
 SCRIPT_DIR = pathlib.Path(__file__).resolve().parent
 SECRETS_FILE = pathlib.Path.home() / ".secrets" / "bigbiggerbiggestbot"