diff --git a/monkey/monkey_island/cc/services/agent_signals_service.py b/monkey/monkey_island/cc/services/agent_signals_service.py
index e58b21cb4eb..dc9cc3b5beb 100644
--- a/monkey/monkey_island/cc/services/agent_signals_service.py
+++ b/monkey/monkey_island/cc/services/agent_signals_service.py
@@ -51,7 +51,7 @@ def _agent_is_first_to_register(self, agent: Agent) -> bool:
         first_to_register = min(
             agents_on_same_machine, key=lambda a: a.registration_time, default=agent
         )
-        return agent is first_to_register
+        return agent.id == first_to_register.id
 
     def _agents_running_on_machine(self, machine_id: MachineID):
         return [
diff --git a/monkey/tests/unit_tests/monkey_island/cc/services/test_agent_signals_service.py b/monkey/tests/unit_tests/monkey_island/cc/services/test_agent_signals_service.py
index bf0edd3782d..19aac00ea4f 100644
--- a/monkey/tests/unit_tests/monkey_island/cc/services/test_agent_signals_service.py
+++ b/monkey/tests/unit_tests/monkey_island/cc/services/test_agent_signals_service.py
@@ -1,3 +1,4 @@
+from copy import copy
 from unittest.mock import MagicMock
 from uuid import UUID
 
@@ -75,7 +76,7 @@ def get_agent_by_id(agent_id: AgentID) -> Agent:
     agent_repository.get_progenitor = MagicMock(return_value=AGENT_1)
     agent_repository.get_agent_by_id = MagicMock(side_effect=get_agent_by_id)
     agent_repository.get_running_agents = MagicMock(
-        return_value=[a for a in ALL_AGENTS if a.stop_time is None]
+        return_value=[copy(a) for a in ALL_AGENTS if a.stop_time is None]
     )
 
     return agent_repository