diff --git a/src/matchbox/server/uploads.py b/src/matchbox/server/uploads.py
index 83d82c58..b4056e9b 100644
--- a/src/matchbox/server/uploads.py
+++ b/src/matchbox/server/uploads.py
@@ -162,10 +162,10 @@ def s3_to_recordbatch(
     task_acks_late=True,
     # Reduce pre-fetching (workers reserving tasks while they're still busy)
     # as it's not ideal for long-running tasks
-    prefetch_multiplier=1,
+    worker_prefetch_multiplier=1,
     # Limit number of tasks a worker can complete before restarting
     # This may prevent OOM errors caused by memory not being deallocated properly
-    worker_max_tasks_per_child=5,
+    worker_max_tasks_per_child=1,
 )