diff --git a/envs/monkey_zoo/blackbox/island_client/monkey_island_client.py b/envs/monkey_zoo/blackbox/island_client/monkey_island_client.py
index 8ffa0978e..b3edac090 100644
--- a/envs/monkey_zoo/blackbox/island_client/monkey_island_client.py
+++ b/envs/monkey_zoo/blackbox/island_client/monkey_island_client.py
@@ -89,7 +89,7 @@ class MonkeyIslandClient(object):
     @avoid_race_condition
     def kill_all_monkeys(self):
         response = self.requests.post_json(
-            "api/agent-signals/terminate-all", json={"kill_time": time.time()}
+            "api/agent-signals/terminate-all", json={"terminate_time": time.time()}
         )
         if response.ok:
             LOGGER.info("Killing all monkeys after the test.")