diff --git a/ansible/roles/test/files/ptftests/py3/advanced-reboot.py b/ansible/roles/test/files/ptftests/py3/advanced-reboot.py
index 3aa13b615d..9fe5432f59 100644
--- a/ansible/roles/test/files/ptftests/py3/advanced-reboot.py
+++ b/ansible/roles/test/files/ptftests/py3/advanced-reboot.py
@@ -1951,7 +1951,7 @@ def examine_flow(self, filename=None):
         self.fails['dut'].clear()
         prev_payload = None
         if packets:
-            prev_payload, prev_time = 0, 0
+            prev_payload, prev_time = -1, 0
             sent_payload = 0
             received_counter = 0    # Counts packets from dut.
             received_but_not_sent_packets = set()