diff --git a/samples/sample_kclpy_app.py b/samples/sample_kclpy_app.py
index 4c39396..c1dceb2 100755
--- a/samples/sample_kclpy_app.py
+++ b/samples/sample_kclpy_app.py
@@ -26,7 +26,6 @@ def __init__(self):
         self._CHECKPOINT_RETRIES = 5
         self._CHECKPOINT_FREQ_SECONDS = 60
         self._largest_seq = (None, None)
-        self._largest_sub_seq = None
         self._last_checkpoint_time = None
 
     def log(self, message):