diff --git a/libs/cli/langgraph_cli/progress.py b/libs/cli/langgraph_cli/progress.py
index 252abd009..f07b48db1 100644
--- a/libs/cli/langgraph_cli/progress.py
+++ b/libs/cli/langgraph_cli/progress.py
@@ -44,7 +44,7 @@ class Progress:
             sys.stdout.flush()
 
     def __enter__(self) -> Callable[[str], None]:
-        if not sys.stdout.isatty():
+        if sys.stdout.isatty():
             self.thread = threading.Thread(target=self.spinner_task)
             self.thread.start()