diff --git a/ext/dapr-ext-workflow/dapr/ext/workflow/dapr_workflow_client.py b/ext/dapr-ext-workflow/dapr/ext/workflow/dapr_workflow_client.py
index 6169c4b8..0d4fb99e 100644
--- a/ext/dapr-ext-workflow/dapr/ext/workflow/dapr_workflow_client.py
+++ b/ext/dapr-ext-workflow/dapr/ext/workflow/dapr_workflow_client.py
@@ -108,7 +108,7 @@ def schedule_new_workflow(
                 reuse_id_policy=reuse_id_policy,
             )
         return self.__obj.schedule_new_orchestration(
-            workflow.__name__, input=input, instance_id=instance_id, start_at=start_at, reuse_id_policy=Union(reuse_id_policy),
+            workflow.__name__, input=input, instance_id=instance_id, start_at=start_at, reuse_id_policy=reuse_id_policy,
         )
 
     def get_workflow_state(