diff --git a/_modules/designatev2/services.py b/_modules/designatev2/services.py
index d18b156..6375812 100644
--- a/_modules/designatev2/services.py
+++ b/_modules/designatev2/services.py
@@ -25,8 +25,8 @@
                 service_list.append(s['service_name'])
 
         for s in services:
-            updated_at = datetime.datetime.strptime(s['updated_at'], '%Y-%m-%dT%H:%M:%S.%f')
-            time_diff = abs((time_actual - updated_at).total_seconds()) <= time_delta
+            heartbeated_at = datetime.datetime.strptime(s['heartbeated_at'], '%Y-%m-%dT%H:%M:%S.%f')
+            time_diff = abs((time_actual - heartbeated_at).total_seconds()) <= time_delta
             service_name = s['service_name']
 
             if s['hostname'] == host and time_diff: