diff --git a/returnn/util/debug.py b/returnn/util/debug.py
index 14f4e3e81..98c65b35e 100644
--- a/returnn/util/debug.py
+++ b/returnn/util/debug.py
@@ -184,7 +184,9 @@ def excepthook(exc_type, exc_obj, exc_tb):
 
     def threading_excepthook(args, /):
         """threading-specific excepthook"""
-        better_exchook(args.exc_type, args.exc_value, args.exc_traceback, file=log.v1 or sys.stdout)
+        better_exchook(
+            args.exc_type, args.exc_value, args.exc_traceback, autodebugshell=False, file=log.v1 or sys.stdout
+        )
         thread.interrupt_main()
 
     threading.excepthook = threading_excepthook