diff --git a/ansible/dualtor/nic_simulator/nic_simulator.py b/ansible/dualtor/nic_simulator/nic_simulator.py
index bba661c2d3a..38196ff0190 100644
--- a/ansible/dualtor/nic_simulator/nic_simulator.py
+++ b/ansible/dualtor/nic_simulator/nic_simulator.py
@@ -183,7 +183,7 @@ def to_string(self):
 class OVSFlow(StrObj):
     """Object to represent an OVS flow."""
 
-    __slots__ = ("in_port", "output_ports", "group", "priority", "_str_prefix")
+    __slots__ = ("in_port", "packet_filter", "output_ports", "group", "priority", "_str_prefix", "drop")
 
     def __init__(self, in_port, packet_filter=None, output_ports=[], group=None, priority=None):
         self.in_port = in_port