diff --git a/billard/tasks.py b/billard/tasks.py
index 05c7d3d..50f3521 100644
--- a/billard/tasks.py
+++ b/billard/tasks.py
@@ -9,7 +9,7 @@ log = logging.getLogger(__name__)
 
 
 def process_client_data():
-    data = ClientData.objects.all()
+    data = ClientData.objects.all().order_by('last_seen')
     for cd in data:
         client = Client.objects.get(uuid=cd.uuid)
         client.last_seen = cd.last_seen