diff --git a/garcon/activity.py b/garcon/activity.py
index 04da141..b64560b 100755
--- a/garcon/activity.py
+++ b/garcon/activity.py
@@ -462,7 +462,7 @@ def run(self):
         return False
 
 
-class ActivityExecution:
+class ActivityExecution(log.GarconLogger):
 
     def __init__(self, client, activity_id, task_token, context):
         """Create an an activity execution.
@@ -486,7 +486,7 @@ def heartbeat(self, details=None):
             details (str): details to add to the heartbeat.
         """
 
-        self.client.record_activity_task_heartbeat(self.task_token,
+        self.client.record_activity_task_heartbeat(taskToken=self.task_token,
             details=details or '')
 
     def fail(self, reason=None):