diff --git a/monkey/tests/unit_tests/monkey_island/cc/resources/test_agent_signals.py b/monkey/tests/unit_tests/monkey_island/cc/resources/test_agent_signals.py
index 673ae6de7..b4a6a4d7f 100644
--- a/monkey/tests/unit_tests/monkey_island/cc/resources/test_agent_signals.py
+++ b/monkey/tests/unit_tests/monkey_island/cc/resources/test_agent_signals.py
@@ -64,6 +64,8 @@ def test_agent_signals_terminate_all_post(flask_client):
         {},
         {"wrong_key": TIMESTAMP_1},
         TIMESTAMP_1,
+        {"terminate_time": 0},
+        {"terminate_time": -1},
     ],
 )
 def test_agent_signals_terminate_all_post__invalid_timestamp(flask_client, bad_data):