diff --git a/jupiterone/client.py b/jupiterone/client.py
index bb4039f..7fefb7b 100644
--- a/jupiterone/client.py
+++ b/jupiterone/client.py
@@ -540,11 +540,13 @@ def start_sync_job(
         endpoint = "/persister/synchronization/jobs"
 
         data = {
-            "source": source,
-            "integrationInstanceId": instance_id,
-            "syncMode": sync_mode,
+               "source": source,
+               "syncMode": sync_mode
         }
 
+        if instance_id is not None:
+            data["integrationInstanceId"] = instance_id
+
         response = self._execute_syncapi_request(endpoint=endpoint, payload=data)
 
         return response