diff --git a/monitoring/uss_qualifier/scenarios/astm/netrid/common/sp_operator_notify_missing_fields.py b/monitoring/uss_qualifier/scenarios/astm/netrid/common/sp_operator_notify_missing_fields.py
index 06539d5af5..df853c7520 100644
--- a/monitoring/uss_qualifier/scenarios/astm/netrid/common/sp_operator_notify_missing_fields.py
+++ b/monitoring/uss_qualifier/scenarios/astm/netrid/common/sp_operator_notify_missing_fields.py
@@ -108,7 +108,7 @@ def _compute_notification_boundaries(self, flights_data):
                 timestamp = telemetry.get("timestamp", None)
                 if timestamp:
                     start_time = min(start_time, timestamp.datetime)
-                    end_time = max(start_time, timestamp.datetime)
+                    end_time = max(end_time, timestamp.datetime)
 
         return start_time, end_time