diff --git a/samples/sample_kclpy_app.py b/samples/sample_kclpy_app.py
index 9cf1ad2..3955092 100755
--- a/samples/sample_kclpy_app.py
+++ b/samples/sample_kclpy_app.py
@@ -36,7 +36,6 @@ 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 initialize(self, initialize_input):