diff --git a/fedn/fedn/network/api/client.py b/fedn/fedn/network/api/client.py
index 32f88e2e8..15cc15ebe 100644
--- a/fedn/fedn/network/api/client.py
+++ b/fedn/fedn/network/api/client.py
@@ -537,7 +537,7 @@ def start_session(
         :rtype: dict
         """
         response = requests.post(self._get_url('start_session'), json={
-            'id': id,
+            'session_id': id,
             'aggregator': aggregator,
             'model_id': model_id,
             'round_timeout': round_timeout,