diff --git a/argos/agent.py b/argos/agent.py
index a0af955..7cc3209 100644
--- a/argos/agent.py
+++ b/argos/agent.py
@@ -39,6 +39,7 @@ class ArgosAgent:
         self.max_tasks = max_tasks
         self.wait_time = wait_time
         self.auth = auth
+        self._http_client = None
 
         self.agent_id = socket.gethostname()