diff --git a/src/ptf/dataplane.py b/src/ptf/dataplane.py
index a1c1b3f..8f0cc6b 100644
--- a/src/ptf/dataplane.py
+++ b/src/ptf/dataplane.py
@@ -881,10 +881,10 @@ def format(self):
                     )
                     for recent_packet in self.recent_packets:
                         print("------------------------------")
-                        if isinstance(self.expected_packet, packet.Packet):
+                        if isinstance(recent_packet, packet.Packet):
                             # Dissect this packet as if it were an instance of
                             # the expected packet's class.
-                            packet.ls(self.expected_packet.__class__(recent_packet))
+                            packet.ls(recent_packet.__class__(recent_packet))
                             print("--")
                         packet.hexdump(recent_packet)
                 else: